automate release build (#173)

- automated release build from tag 
- create release notes by collecting PR titels and commit messages since
previous tag

Author: kathrin-7978

.github/workflows/release.yml

@@ -0,0 +1,16 @@
+name: Create Release
+
+on:
+  push:
+    tags:
+      - 'pdf-over-*'
+
+jobs:
+  release:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+    steps:
+      - uses: softprops/action-gh-release@v2
+        with:
+          generate_release_notes: true