fix: improvements on docker extra_files

Dockerfile

@@ -10,7 +10,7 @@ RUN apk add --no-cache bash \
 ENTRYPOINT ["/entrypoint.sh"]
 CMD [ "-h" ]
 
-COPY entrypoint.sh /entrypoint.sh
-COPY goreleaser /bin/goreleaser
-
+COPY scripts/entrypoint.sh /entrypoint.sh
 RUN chmod +x /entrypoint.sh
+
+COPY goreleaser /bin/goreleaser

Dockerfile.cgo

@@ -11,7 +11,7 @@ RUN apk add --no-cache bash \
 ENTRYPOINT ["/entrypoint.sh"]
 CMD [ "-h" ]
 
-COPY entrypoint.sh /entrypoint.sh
-COPY goreleaser /bin/goreleaser
-
+COPY scripts/entrypoint.sh /entrypoint.sh
 RUN chmod +x /entrypoint.sh
+
+COPY goreleaser /bin/goreleaser

internal/pipe/docker/docker.go

@@ -138,7 +138,10 @@ func process(ctx *context.Context, docker config.Docker, bin artifact.Artifact)
 		return errors.Wrap(err, "failed to link dockerfile")
 	}
 	for _, file := range docker.Files {
-		if err := link(file, filepath.Join(tmp, filepath.Base(file))); err != nil {
+		if err := os.MkdirAll(filepath.Join(tmp, filepath.Dir(file)), 0755); err != nil {
+			return errors.Wrapf(err, "failed to link extra file '%s'", file)
+		}
+		if err := link(file, filepath.Join(tmp, file)); err != nil {
 			return errors.Wrapf(err, "failed to link extra file '%s'", file)
 		}
 	}

www/content/docker.md

@@ -67,7 +67,7 @@ dockers:
     # Defaults to false.
     skip_push: false
     # Path to the Dockerfile (from the project root).
-    dockerfile: Dockerfile 
+    dockerfile: Dockerfile
     # Template of the docker build flags.
     build_flag_templates:
     - "--label=org.label-schema.schema-version=1.0"
@@ -76,6 +76,13 @@ dockers:
     - "--build-arg=FOO={{.ENV.Bar}}"
     # If your Dockerfile copies files other than the binary itself,
     # you should list them here as well.
+    # Note that goreleaser will create the same structure inside the temporary
+    # folder, so if you add `foo/bar.json` here, on your Dockerfile you can
+    # `COPY foo/bar.json /whatever.json`.
+    # Also note that the paths here are relative to the folder in which
+    # goreleaser is being run.
+    # This field does not support wildcards, you can add an entire folder here
+    # and use wildcards when you `COPY`/`ADD` in your Dockerfile.
     extra_files:
     - config.yml
 ```
@@ -159,7 +166,6 @@ This will build and publish the following images to `docker.io` and `gcr.io`:
 - `myuser/myimage:v1.6.4`
 - `myuser/myimage:latest`
 
-
 ## Applying docker build flags
 
 Build flags can be applied using `build_flag_templates`. The flags must be