add changelog generation

.github/workflows/publish-dry.yaml

@@ -0,0 +1,29 @@
+name: Publish to pub.dev
+
+on:
+  push:
+    branches:
+      - changelog
+
+# Publish using custom workflow
+jobs:
+  publish:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - uses: dart-lang/setup-dart@v1
+      - name: Install dependencies
+        run: dart pub get
+      - name: Add version
+        run: |
+          echo -e "\n\nversion: ${GITHUB_REF_NAME##v}" >> pubspec.yaml
+      - name: Update CHANGELOG
+        id: changelog
+        uses: requarks/changelog-action@v1
+        with:
+          token: ${{ secrets.NITRIC_BOT_TOKEN }}
+          fromTag: v1.0.0
+          toTag: v0.0.0
+          writeToFile: true
+      - name: Check Publish Warnings
+        run: dart pub publish --dry-run