feat: add dynamic changelog bullet points to GitHub release notes

Parse feat/fix commits since previous tag and render them as
'What's New' and 'Bug Fixes' sections in the release body.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.github/workflows/release.yml

@@ -99,6 +99,29 @@ jobs:
           APK=$(ls artifacts/postiz-mobile/dist/*.apk | sort | tail -1)
           echo "path=$APK" >> "$GITHUB_OUTPUT"
 
+      - name: Generate changelog
+        id: changelog
+        run: |
+          PREV_TAG=$(git tag --sort=-version:refname | grep -v "^${{ github.ref_name }}$" | head -1)
+          echo "Previous tag: $PREV_TAG"
+
+          FEATS=$(git log "${PREV_TAG}..HEAD" --pretty=format:"%s" --no-merges \
+            | grep -E "^feat(\([^)]+\))?: " \
+            | sed -E 's/^feat(\([^)]+\))?: //' \
+            | sed 's/^/- /')
+
+          FIXES=$(git log "${PREV_TAG}..HEAD" --pretty=format:"%s" --no-merges \
+            | grep -E "^fix(\([^)]+\))?: " \
+            | sed -E 's/^fix(\([^)]+\))?: //' \
+            | sed 's/^/- /')
+
+          {
+            echo "changelog<<CEOF"
+            [ -n "$FEATS" ] && printf "### What's New\n%s\n\n" "$FEATS"
+            [ -n "$FIXES" ] && printf "### Bug Fixes\n%s\n\n" "$FIXES"
+            echo "CEOF"
+          } >> "$GITHUB_OUTPUT"
+
       - name: Create GitHub Release
         uses: softprops/action-gh-release@v2
         with:
@@ -106,8 +129,7 @@ jobs:
           body: |
             ## Postiz Mobile ${{ github.ref_name }}
 
-            Signed APK for Android — direct install (sideload).
-
+            ${{ steps.changelog.outputs.changelog }}
             ### Installation
             1. Enable "Unknown sources" on the device
             2. Transfer the APK to the device and open it to install