Move to uv for dependency management, add Docker image

.woodpecker/docker-buildx.yml

@@ -0,0 +1,24 @@
+when:
+  branch: main
+  event:
+    - push
+
+variables:
+  - &repo scm.gruezi.net/${CI_REPO}
+
+steps:
+  publish:
+    image: docker.io/woodpeckerci/plugin-docker-buildx:latest
+    settings:
+      repo: *repo
+      registry: scm.gruezi.net
+      tags: latest
+      username: woodpecker_bot
+      password:
+        from_secret: FORGEJO_PACKAGES_API_TOKEN
+      platforms: linux/amd64,linux/arm64
+    when:
+      event: push
+
+depends_on:
+  - lint

.woodpecker/lint.yml

@@ -2,9 +2,7 @@ when:
   branch: main
 steps:
   - name: lint
-    image: python:3-slim
+    image: ghcr.io/astral-sh/uv:python3.13-bookworm
     commands:
-      - python -m pip install --upgrade pip
-      - python -m pip install -r requirements.txt
-      - python -m pip install ruff
-      - ruff check .
+      - uv sync
+      - uvx ruff check