Create GitHub action for releasing _freeze folder

.github/workflows/create_release.yml

@@ -0,0 +1,59 @@
+name: Create release with _freeze
+
+on:
+  workflow_dispatch:
+  # Comment out before merging!!
+  push:
+    branches:
+      - py/release-workflow
+
+permissions:
+  contents: write
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup Julia
+        uses: julia-actions/setup-julia@v2
+        with:
+          version: '1.10'
+
+      - name: Set up Quarto
+        uses: quarto-dev/quarto-actions/setup@v2
+        with:
+          # Needs Quarto 1.6 (which is currently a pre-release version) to fix #533
+          version: pre-release
+
+      - name: Render
+        run: quarto render
+
+      - name: Compress _freeze folder
+        run: tar -czf _freeze.tar.gz _freeze
+
+      - name: Generate tag name for release
+        id: tag
+        run: echo "tag_name=freeze_$(git rev-parse --short HEAD)" >> $GITHUB_OUTPUT
+
+      - name: Create GitHub release
+        uses: softprops/action-gh-release@v2
+        with:
+          tag_name: ${{ steps.tag.outputs.tag_name }}
+          files:
+            - _freeze.tar.gz
+            - Manifest.toml
+          body: |
+            This release contains the `_freeze` folder generated by Quarto when
+            rendering the docs. You can use this to speed up the rendering process
+            on your local machine by downloading and extracting the `_freeze` folder,
+            then placing it at the root of the project.
+
+            Note that the contents of the `_freeze` folder only hash the contents of
+            the .qmd files, and do not include information about the Julia environment.
+            Thus, each `_freeze` folder is only valid for a given Julia environment,
+            which is specified in the Manifest.toml file included in this release. To
+            ensure reproducibility, you should make sure to use the Manifest.toml file
+            locally as well.