woodpecker: refactor pipeline to use kaniko.

.woodpecker.yml

@@ -1,8 +1,13 @@
+when:
+  - event: push
+    branch: main
+
 steps:
-  build:
+  - name: build
     image: golang:1.22
     commands:
       - go mod edit -dropreplace gitea.maximumdirect.net/ejr/feedkit
+      - go test ./...
       - mkdir -p dist
       - CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -trimpath -ldflags "-s -w" -o dist/weatherfeeder ./cmd/weatherfeeder
       - |
@@ -14,22 +19,21 @@ steps:
         USER app
         ENTRYPOINT ["/usr/local/bin/weatherfeeder"]
         EOF
-    when:
-      branch: main
-      event: push
 
-  publish:
-    image: plugins/docker
+  - name: publish
+    image: woodpeckerci/plugin-kaniko
     settings:
-      registry: harbor.maximumdirect.net
-      repo: harbor.maximumdirect.net/build/weatherfeeder
+      registry: https://harbor.maximumdirect.net
+      repo: build/weatherfeeder
+      dockerfile: Dockerfile.ci
+      context: .
       tags:
         - ${CI_COMMIT_SHA}
         - latest
-      dockerfile: Dockerfile.ci
-      context: .
-    depends_on:
-      - build
-    when:
-      branch: main
-      event: push
+      cache: true
+      cache-repo: build/weatherfeeder-cache
+      username:
+        from_secret: HARBOR_ROBOT_USER
+      password:
+        from_secret: HARBOR_ROBOT_TOKEN
+