diff --git a/.github/actions/galaxy-social/action.yml b/.github/actions/galaxy-social/action.yml
new file mode 100644
index 0000000..dbe3025
--- /dev/null
+++ b/.github/actions/galaxy-social/action.yml
@@ -0,0 +1,71 @@
+name: Galaxy Social composite action
+description: Perform common steps for getting changed files, setting up the environment, and running the main logic.
+inputs:
+  files:
+    description: "File patterns to check for changes"
+    default: "posts/**"
+
+  preview:
+    description: "Whether to create a preview or not"
+    default: "false"
+
+runs:
+  using: "composite"
+  steps:
+    - name: checkout #This is needed to avoid error on post action
+      uses: actions/checkout@v4
+
+    - name: Get changed files in posts folder
+      id: get_changed_files
+      uses: tj-actions/changed-files@v44
+      with:
+        files: ${{ inputs.files }}
+        json: "true"
+
+    - name: get published files cache
+      if: steps.get_changed_files.outputs.any_changed == 'true'
+      shell: bash
+      run: |
+        if ! git ls-remote --heads origin | grep -q "refs/heads/processed_files"; then
+          git checkout --orphan processed_files
+          git rm -rf .
+          echo "{}" > processed_files.json
+          git add processed_files.json
+          git config user.name 'github-actions[bot]'
+          git config user.email 'github-actions[bot]@users.noreply.github.com'
+          git commit -m "Initialize processed_files branch with processed_files.json"
+          git push origin processed_files
+          git checkout main
+        fi
+        git fetch origin processed_files:processed_files
+        git checkout processed_files -- processed_files.json
+
+    - name: Set up Python
+      if: steps.get_changed_files.outputs.any_changed == 'true'
+      uses: actions/setup-python@v5
+      with:
+        python-version: "3.12"
+
+    - name: Install dependencies
+      if: steps.get_changed_files.outputs.any_changed == 'true'
+      shell: bash
+      run: |
+        python -m pip install --upgrade pip
+        python -m pip install -r requirements.txt
+
+    - name: Run script to create preview
+      if: steps.get_changed_files.outputs.any_changed == 'true' && inputs.preview == 'true'
+      shell: bash
+      run: python -u github_run.py --preview
+
+    - name: Run script to publish contents
+      if: steps.get_changed_files.outputs.any_changed == 'true' && inputs.preview == 'false'
+      shell: bash
+      run: python -u github_run.py --json-out processed_files.json
+
+    - name: Commit changes
+      if: steps.get_changed_files.outputs.any_changed == 'true' && inputs.preview == 'false'
+      uses: stefanzweifel/git-auto-commit-action@v5
+      with:
+        file_pattern: "processed_files.json"
+        branch: "processed_files"
diff --git a/.github/workflows/preview.yml b/.github/workflows/preview.yml
index 880b8a0..0872219 100644
--- a/.github/workflows/preview.yml
+++ b/.github/workflows/preview.yml
@@ -4,53 +4,31 @@ on:
   pull_request_target:
     branches: [main]
     types: [opened, synchronize, reopened]
+    paths:
+      - "posts/**"
 
 jobs:
   preview:
     name: Preview
     runs-on: ubuntu-latest
     permissions:
+      contents: write
       pull-requests: write
     steps:
       - name: Checkout
         uses: actions/checkout@v4
 
-      - name: Get changed files in posts folder
-        id: get_changed_files
-        uses: tj-actions/changed-files@v44
-        with:
-          files: posts/**
-          json: "true"
-
-      - name: get published files cache
-        if: steps.get_changed_files.outputs.any_changed == 'true'
+      - name: Set environment variables
         run: |
-          git fetch origin processed_files:processed_files
-          git checkout processed_files -- processed_files.json
+          echo "PR_NUMBER=${{ github.event.number }}" >> $GITHUB_ENV
+          echo "GITHUB_TOKEN=${{ secrets.GITHUB_TOKEN }}" >> $GITHUB_ENV
+          echo "MASTODON_ACCESS_TOKEN=${{ secrets.MASTODON_ACCESS_TOKEN }}" >> $GITHUB_ENV
+          echo "BLUESKY_PASSWORD=${{ secrets.BLUESKY_PASSWORD }}" >> $GITHUB_ENV
+          echo "MATRIX_ACCESS_TOKEN=${{ secrets.MATRIX_ACCESS_TOKEN }}" >> $GITHUB_ENV
+          echo "SLACK_ACCESS_TOKEN=${{ secrets.SLACK_ACCESS_TOKEN }}" >> $GITHUB_ENV
+          echo "MASTODON_EU_FR_TOKEN=${{ secrets.MASTODON_EU_FR_TOKEN }}" >> $GITHUB_ENV
 
-      - name: Set up Python
-        if: steps.get_changed_files.outputs.any_changed == 'true'
-        uses: actions/setup-python@v5
+      - name: Run composite action
+        uses: ./.github/actions/galaxy-social
         with:
-          python-version: '3.12'
-
-      - name: Install dependencies
-        if: steps.get_changed_files.outputs.any_changed == 'true'
-        run: |
-          python -m pip install --upgrade pip
-          python -m pip install -r requirements.txt
-
-      - name: Run script to create preview
-        if: steps.get_changed_files.outputs.any_changed == 'true'
-        env:
-          MASTODON_ACCESS_TOKEN: ${{ secrets.MASTODON_ACCESS_TOKEN }}
-          BLUESKY_USERNAME: ${{ secrets.BLUESKY_USERNAME }}
-          BLUESKY_PASSWORD: ${{ secrets.BLUESKY_PASSWORD }}
-          MASTODON_EU_FR_TOKEN: ${{ secrets.MASTODON_EU_FR_TOKEN }}
-          MATRIX_ACCESS_TOKEN: ${{ secrets.MATRIX_ACCESS_TOKEN }}
-          SLACK_ACCESS_TOKEN: ${{ secrets.SLACK_ACCESS_TOKEN }}
-          SLACK_CHANNEL_ID: ${{ secrets.SLACK_CHANNEL_ID }}
-          CHANGED_FILES: ${{ steps.get_changed_files.outputs.all_changed_files }}
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-          PR_NUMBER: ${{ github.event.number }}
-        run: python -u github_run.py --preview
+          preview: "true"
diff --git a/.github/workflows/publish_content.yml b/.github/workflows/publish_content.yml
index 9af8f3c..bc8617f 100644
--- a/.github/workflows/publish_content.yml
+++ b/.github/workflows/publish_content.yml
@@ -4,10 +4,13 @@ on:
   pull_request_target:
     branches: [main]
     types: [closed]
+    paths:
+      - "posts/**"
 
 jobs:
   publish:
     if: github.event.pull_request.merged == true
+    name: Publish content
     runs-on: ubuntu-latest
     permissions:
       contents: write
@@ -16,49 +19,15 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v4
 
-      - name: Get changed files in posts folder
-        id: get_changed_files
-        uses: tj-actions/changed-files@v44
-        with:
-          files: posts/**
-          json: "true"
-
-      - name: get published files cache
-        if: steps.get_changed_files.outputs.any_changed == 'true'
-        run: |
-          git fetch origin processed_files:processed_files
-          git checkout processed_files -- processed_files.json
-
-      - name: Set up Python
-        if: steps.get_changed_files.outputs.any_changed == 'true'
-        uses: actions/setup-python@v5
-        with:
-          python-version: '3.12'
-
-      - name: Install dependencies
-        if: steps.get_changed_files.outputs.any_changed == 'true'
+      - name: Set environment variables
         run: |
-          python -m pip install --upgrade pip
-          python -m pip install -r requirements.txt
-
-      - name: Run script to publish contents
-        if: steps.get_changed_files.outputs.any_changed == 'true'
-        env:
-          MASTODON_ACCESS_TOKEN: ${{ secrets.MASTODON_ACCESS_TOKEN }}
-          BLUESKY_USERNAME: ${{ secrets.BLUESKY_USERNAME }}
-          BLUESKY_PASSWORD: ${{ secrets.BLUESKY_PASSWORD }}
-          MASTODON_EU_FR_TOKEN: ${{ secrets.MASTODON_EU_FR_TOKEN }}
-          MATRIX_ACCESS_TOKEN: ${{ secrets.MATRIX_ACCESS_TOKEN }}
-          SLACK_ACCESS_TOKEN: ${{ secrets.SLACK_ACCESS_TOKEN }}
-          SLACK_CHANNEL_ID: ${{ secrets.SLACK_CHANNEL_ID }}
-          CHANGED_FILES: ${{ steps.get_changed_files.outputs.all_changed_files }}
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-          PR_NUMBER: ${{ github.event.number }}
-        run: python -u github_run.py --json-out processed_files.json
-
-      - name: Commit changes
-        if: steps.get_changed_files.outputs.any_changed == 'true'
-        uses: stefanzweifel/git-auto-commit-action@v5
-        with:
-          file_pattern: "processed_files.json"
-          branch: "processed_files"
+          echo "PR_NUMBER=${{ github.event.number }}" >> $GITHUB_ENV
+          echo "GITHUB_TOKEN=${{ secrets.GITHUB_TOKEN }}" >> $GITHUB_ENV
+          echo "MASTODON_ACCESS_TOKEN=${{ secrets.MASTODON_ACCESS_TOKEN }}" >> $GITHUB_ENV
+          echo "BLUESKY_PASSWORD=${{ secrets.BLUESKY_PASSWORD }}" >> $GITHUB_ENV
+          echo "MATRIX_ACCESS_TOKEN=${{ secrets.MATRIX_ACCESS_TOKEN }}" >> $GITHUB_ENV
+          echo "SLACK_ACCESS_TOKEN=${{ secrets.SLACK_ACCESS_TOKEN }}" >> $GITHUB_ENV
+          echo "MASTODON_EU_FR_TOKEN=${{ secrets.MASTODON_EU_FR_TOKEN }}" >> $GITHUB_ENV
+
+      - name: Run composite action
+        uses: ./.github/actions/galaxy-social
diff --git a/plugins.yml b/plugins.yml
index 689073d..14826ec 100644
--- a/plugins.yml
+++ b/plugins.yml
@@ -12,7 +12,7 @@ plugins:
     enabled: false
     config:
       base_url: "https://bsky.social"
-      username: $BLUESKY_USERNAME
+      username: ""
       password: $BLUESKY_PASSWORD
       max_content_length: 300
 
@@ -37,7 +37,7 @@ plugins:
     enabled: false
     config:
       access_token: $SLACK_ACCESS_TOKEN
-      channel_id: $SLACK_CHANNEL_ID
+      channel_id: ""
       max_content_length: 40000
 
   - name: markdown