add release notes extraction for GitHub draft releases

.github/workflows/gh-release.yml

@@ -52,10 +52,53 @@ jobs:
           flutter build apk --dart-define CLIENT_ID=$CLIENT_ID --dart-define SECRET=$SECRET
           mv build/app/outputs/flutter-apk/app-release.apk frosty-${{ github.ref_name }}.apk
 
+      # Extract release notes from assets/release-notes.md for the current version.
+      - name: Extract release notes
+        id: release_notes
+        run: |
+          VERSION="${{ github.ref_name }}"
+          RELEASE_NOTES_FILE="assets/release-notes.md"
+
+          # Extract the section for this version using awk
+          # Starts at "## vX.X.X", skips date line, stops at next "---" or "## v" header
+          NOTES=$(awk -v version="$VERSION" '
+            BEGIN { found=0; output="" }
+            $0 ~ "^## " version "$" { found=1; next }
+            found && /^[A-Z][a-z]+ [0-9]+, [0-9]+$/ { next }
+            found && /^---$/ { exit }
+            found && /^## v[0-9]+\.[0-9]+\.[0-9]+$/ { exit }
+            found { output = output $0 "\n" }
+            END { print output }
+          ' "$RELEASE_NOTES_FILE")
+
+          # Clean up "on GitHub" suffix (redundant since we're on GitHub)
+          NOTES=$(echo "$NOTES" | sed 's/ on GitHub)/)/')
+
+          # Trim leading/trailing whitespace
+          NOTES=$(echo "$NOTES" | sed -e 's/^[[:space:]]*//' -e 's/[[:space:]]*$//')
+
+          if [ -n "$NOTES" ]; then
+            # Get the previous tag for the Full Changelog link
+            PREV_TAG=$(git describe --tags --abbrev=0 "$VERSION^" 2>/dev/null || echo "")
+
+            echo "found=true" >> $GITHUB_OUTPUT
+            echo "body<<EOF" >> $GITHUB_OUTPUT
+            echo "$NOTES" >> $GITHUB_OUTPUT
+            if [ -n "$PREV_TAG" ]; then
+              echo "" >> $GITHUB_OUTPUT
+              echo "**Full Changelog**: https://github.com/${{ github.repository }}/compare/${PREV_TAG}...${VERSION}" >> $GITHUB_OUTPUT
+            fi
+            echo "EOF" >> $GITHUB_OUTPUT
+          else
+            echo "found=false" >> $GITHUB_OUTPUT
+            echo "::warning::No release notes found for $VERSION in $RELEASE_NOTES_FILE"
+          fi
+
       # Create a draft release on GitHub.
       - name: Release
         uses: softprops/action-gh-release@v2
         with:
           draft: true
-          generate_release_notes: true
+          generate_release_notes: ${{ steps.release_notes.outputs.found != 'true' }}
+          body: ${{ steps.release_notes.outputs.found == 'true' && steps.release_notes.outputs.body || '' }}
           files: frosty-${{ github.ref_name }}.apk