allows extra copies in the docker image

config/config.go

@@ -161,13 +161,14 @@ type Checksum struct {
 
 // Docker image config
 type Docker struct {
-	Binary     string `yaml:",omitempty"`
-	Goos       string `yaml:",omitempty"`
-	Goarch     string `yaml:",omitempty"`
-	Goarm      string `yaml:",omitempty"`
-	Image      string `yaml:",omitempty"`
-	Dockerfile string `yaml:",omitempty"`
-	Latest     bool   `yaml:",omitempty"`
+	Binary     string   `yaml:",omitempty"`
+	Goos       string   `yaml:",omitempty"`
+	Goarch     string   `yaml:",omitempty"`
+	Goarm      string   `yaml:",omitempty"`
+	Image      string   `yaml:",omitempty"`
+	Dockerfile string   `yaml:",omitempty"`
+	Latest     bool     `yaml:",omitempty"`
+	Files      []string `yaml:"extra_files,omitempty"`
 
 	// Capture all undefined fields and should be empty after loading
 	XXX map[string]interface{} `yaml:",inline"`

docs/130-docker.md

@@ -52,6 +52,10 @@ dockers:
     dockerfile: Dockerfile
     # Also tag and push myuser/myimage:latest
     latest: true
+    # If your dockerfile copies more files other than the binary itself,
+    # you should list them here as well.
+    extra_files:
+    - config.yml
 ```
 
 These settings should allow you to generate multiple docker images, using

pipeline/docker/docker.go

@@ -71,6 +71,11 @@ func process(ctx *context.Context, folder string, docker config.Docker, binary c
 	if err := os.Link(docker.Dockerfile, dockerfile); err != nil {
 		return errors.Wrap(err, "failed to link dockerfile")
 	}
+	for _, file := range docker.Files {
+		if err := os.Link(file, filepath.Join(root, filepath.Base(file))); err != nil {
+			return errors.Wrapf(err, "failed to link extra file '%s'", file)
+		}
+	}
 	if err := dockerBuild(root, dockerfile, image); err != nil {
 		return err
 	}