Create cleanup.yml (#12)

Signed-off-by: David Matějček <david.matejcek@omnifish.ee>

.github/workflows/cleanup.yml

@@ -0,0 +1,27 @@
+name: Packages Cleanup
+
+on:
+  push:
+    branches: [ "main" ]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    permissions:
+      contents: read
+      packages: write
+      # This is used to complete the identity challenge
+      # with sigstore/fulcio when running outside of PRs.
+      id-token: write
+
+    steps:
+      - name: Delete Untagged
+        uses: actions/delete-package-versions@v5
+        with:
+          owner: ${{ github.repository_owner }}
+          package-type: container
+          package-name: glassfish
+          delete-only-untagged-versions: 'true'
+          token: ${{ secrets.GITHUB_TOKEN }}