build: Add workflow to create release from tags

Let's automate the release process. The trigger to build a release is
the release tag.

Signed-off-by: Daniel Wagner <[email protected]>

Author: dwsuse

.github/workflows/release.yml

@@ -0,0 +1,19 @@
+name: Releases
+
+on:
+  push:
+    branches: [ master ]
+    tags:
+      - '**'
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    if: startsWith(github.ref, 'refs/tags/v')
+    permissions:
+      contents: write
+    steps:
+    - uses: actions/checkout@v2
+    - uses: ncipollo/release-action@v1
+      with:
+        token: ${{ secrets.GITHUB_TOKEN }}