fix(ci): replace drone with gitea actions

.gitea/workflows/update-docker-hub-description.yaml

@@ -0,0 +1,22 @@
+name: Update Docker Hub Description
+
+on:
+  push:
+    branches:
+    - master
+    paths:
+    - README.md
+  workflow_dispatch: {}
+
+jobs:
+  update-description-on-hub-docker-io:
+    runs-on:
+    - ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4.2.2
+    - uses: peter-evans/dockerhub-description@v4.0.2
+      with:
+        username: ${{ secrets.DOCKER_IO_USERNAME }}
+        password: ${{ secrets.DOCKER_IO_PASSWORD }}
+        repository: volkerraschek/postfixadmin
+        readme-filepath: README.md