Add GitHub Action to create upstream tag

This action can be triggered manually from the GitHub Actions tab.

.github/workflows/create-tag.yml

@@ -0,0 +1,17 @@
+# This action creates a tag and pushes it
+name: "Create and push release tag"
+
+on:
+  workflow_dispatch:
+
+jobs:
+  tag-and-push:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Upstream tag
+        uses: osbuild/release-action@create-tag
+        with:
+          token: "${{ secrets.SCHUTZBOT_GITHUB_ACCESS_TOKEN }}"
+          username: "imagebuilder-bot"
+          email: "imagebuilder-bots+imagebuilder-bot@redhat.com"