GHA: create release workflow on stable

Author: junghans

.github/workflows/create-release.yml

@@ -0,0 +1,20 @@
+name: Make Release
+on:
+  push:
+    tags:
+    - 'v[1-9]*'
+
+jobs:
+  release:
+    name: Make Release
+    if: github.repository_owner == 'votca'
+    runs-on: ubuntu-latest
+    steps:
+      - name: Create Release
+        uses: actions/create-release@v1
+        env:
+          GITHUB_TOKEN: ${{ secrets.VOTCA_BOT_TOKEN }}
+        with:
+          tag_name: ${{ github.ref }}
+          release_name: ${{ github.ref }}
+          prerelease: ${{ contains(github.ref, 'rc') }}