fix(build.go): comment out unused variables

I’m not sure where these vars need to be used yet, so leaving them
commented

Author: arschles

pkg/gitreceive/build.go

@@ -110,7 +110,6 @@ func build(conf *Config, etcdClient *etcd.Client) error {
 	// GIT_SHA=$3
 	// SHORT_SHA=${GIT_SHA:0:8}
 	// APP_NAME="${REPO%.*}"
-	user := conf.Username
 	repo := conf.Repository
 	gitSha := conf.SHA
 	if len(gitSha) <= shortShaIdx {
@@ -131,7 +130,7 @@ func build(conf *Config, etcdClient *etcd.Client) error {
 	}
 	repoDir := filepath.Join(rootDir, repo)
 	buildDir := filepath.Join(repoDir, "build")
-	cacheDir := filepath.Join(repoDir, "cache")
+	// cacheDir := filepath.Join(repoDir, "cache")
 	//
 	// # define image names
 	// SLUG_NAME="$APP_NAME:git-$SHORT_SHA"
@@ -142,7 +141,7 @@ func build(conf *Config, etcdClient *etcd.Client) error {
 	// # create temporary directory inside the build dir for this push
 	// TMP_DIR=$(mktemp -d -p $BUILD_DIR)
 	slugName := fmt.Sprintf("%s:git-%s", appName, shortSha)
-	metaName := strings.Replace(slugName, ":", "-", -1)
+	// metaName := strings.Replace(slugName, ":", "-", -1)
 	tmpImage := fmt.Sprintf("%s:%s/%s", conf.RegistryHost, conf.RegistryPort, conf.ImageName)
 	if err := os.MkdirAll(buildDir, os.ModeDir); err != nil {
 		return fmt.Errorf("making the build directory %s (%s)", buildDir, err)