Add publish CI job

.woodpecker/publish.yaml

@@ -0,0 +1,12 @@
+when:
+  - event: tag
+
+steps:
+  - name: publish package
+    image: ghcr.io/astral-sh/uv:python3.11-alpine
+    commands:
+      - uv build
+      - uv publish --index forgejo
+    environment:
+      UV_PUBLISH_TOKEN:
+        from_secret: publish_token