feat: Woodpecker-Plugin deploy für oumta-deploy

Schreibt dev- und beta-Images mit Digest nach tanztee/oumta-deploy über
dessen ci/deploy-image.sh. Gebaut per .woodpecker/plugins.yaml, Release
über Tag deploy-vX.Y.Z.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

.woodpecker/plugins.yaml

@@ -0,0 +1,33 @@
+# Builds the plugins in woodpecker/<name>/. A tag <name>-vX.Y.Z pushes
+# git.uesome.de/actions/ci-cd/<name>:vX.Y.Z; pushes and PRs only test the build.
+when:
+  - event: [push, pull_request]
+    path: 'woodpecker/deploy/**'
+  - event: tag
+    ref: refs/tags/deploy-v*
+
+steps:
+  - name: deploy-plugin-check
+    image: woodpeckerci/plugin-docker-buildx:6.1.2
+    settings:
+      repo: git.uesome.de/actions/ci-cd/deploy
+      context: woodpecker/deploy
+      dockerfile: woodpecker/deploy/Dockerfile
+      dry_run: true
+    when:
+      event: [push, pull_request]
+
+  - name: deploy-plugin
+    image: woodpeckerci/plugin-docker-buildx:6.1.2
+    settings:
+      registry: git.uesome.de
+      repo: git.uesome.de/actions/ci-cd/deploy
+      context: woodpecker/deploy
+      dockerfile: woodpecker/deploy/Dockerfile
+      tags: ${CI_COMMIT_TAG##deploy-}
+      username:
+        from_secret: registry_username
+      password:
+        from_secret: registry_password
+    when:
+      event: tag