feat(publish): example publishing to some remote registry

dagger/src/index.ts

@@ -59,6 +59,20 @@ class HelloDagger {
       .withExec(["golangci-lint", "run", "-v"]);
   }
 
+  @func()
+  async publish(source: Directory, target?: string): Promise<string> {
+    // publish can only push to external registries
+    // to publish to your local docker, you have to export the tarball and use `docker load`
+
+    // This example is somewhat useless as one could just chain `publish` to `call build`
+
+    // publish automatically picks up the local auth from the host
+    // otherwise, use `withRegistryAuth()`
+    return this.build(source).publish(
+      target ?? "mtr.devops.telekom.de/patrick_sy/hello-dagger:latest",
+    );
+  }
+
   /**
    * Build a ready-to-use development environment
    */