add supplemental container support

pkg/config.go

@@ -1,9 +1,29 @@
 package pkg
 
-type ProjectConfig struct {
+type Volume struct {
+	Mountpoint string `json:"mountpoint,omitempty"`
+}
+
+type Container struct {
 	Name        string   `json:"name,omitempty"`
-	Url         string   `json:"url,omitempty"`
-	Port        uint16   `json:"port,omitempty"`
-	EnvFile     string   `json:"env_file,omitempty"`
+	ImageName   string   `json:"image,omitempty"`
+	Volumes     []Volume `json:"volumes,omitempty"`
 	Environment []string `json:"environment,omitempty"`
 }
+
+type ProjectConfig struct {
+	// name of the app
+	Name string `json:"name,omitempty"`
+	// public url of the app
+	// TODO: support multiple urls
+	Url string `json:"url,omitempty"`
+	// Port the web app listens on from the head container
+	Port    uint16 `json:"port,omitempty"`
+	EnvFile string `json:"env_file,omitempty"`
+	// additional environment variables
+	Environment []string `json:"environment,omitempty"`
+	// volumes for the head container
+	Volumes []Volume `json:"volumes,omitempty"`
+	// config for supplemental containersm
+	Containers []Container `json:"containers,omitempty"`
+}