CI: add webhook triggering quay.io

.forgejo/workflows/webhook.yml

@@ -0,0 +1,16 @@
+name: Trigger quay.io Webhook
+
+on:
+  push:
+
+jobs:
+  run:
+    runs-on: alpine-latest
+    steps:
+      - run: |
+        apk add ca-certificates curl
+        curl -v -X POST --data '{
+          "commit": "${{forgejo.sha}}",
+          "ref": "${{forgejo.ref}}",
+          "default-branch": "main"
+        }' 'https://$token:${{secrets.quay_token}}@quay.io/webhooks/push/trigger/48d15dc7-ef9a-45bd-83e6-e1714c73dca6'