ci improvements

.woodpecker/tools-wasm-pack-plugin.yml

@@ -1,4 +1,17 @@
 pipeline:
+  build:
+    image: plugins/docker
+    settings:
+      dry_run: true
+      context: tools/wasm-pack-plugin
+      dockerfile: tools/wasm-pack-plugin/Dockerfile
+    when:
+      branch:
+        exclude: [master]
+      path:
+        include:
+          - tools/wasm-pack-plugin/*
+          - .woodpecker/tools-wasm-pack-plugin.yml
   build and publish:
     image: plugins/docker
     settings:
@@ -12,6 +25,7 @@ pipeline:
       context: tools/wasm-pack-plugin
       dockerfile: tools/wasm-pack-plugin/Dockerfile
     when:
+      branch: master
       path:
         include:
           - tools/wasm-pack-plugin/*