stdlib: yarn: support cwd, args and packages

Signed-off-by: Andrea Luzzardi <aluzzardi@gmail.com>

stdlib/js/yarn/yarn.cue

@@ -15,6 +15,14 @@ import (
 	// Application source code
 	source: dagger.#Artifact @dagger(input)
 
+	// Extra alpine packages to install
+	package: {
+		[string]: true | false | string @dagger(input)
+	}
+
+	// working directory to use
+	cwd: *"." | string @dagger(input)
+
 	// Environment variables
 	env: {
 		[string]: string @dagger(input)
@@ -31,6 +39,9 @@ import (
 	// Run this yarn script
 	script: string | *"build" @dagger(input)
 
+	// Optional arguments for the script
+	args: [...string] | *[] @dagger(input)
+
 	build: os.#Dir & {
 		from: ctr
 		path: "/build"
@@ -38,7 +49,7 @@ import (
 
 	ctr: os.#Container & {
 		image: alpine.#Image & {
-			package: {
+			"package": package & {
 				bash: "=~5.1"
 				yarn: "=~1.22"
 			}
@@ -46,13 +57,17 @@ import (
 		shell: path: "/bin/bash"
 		command: """
 			[ -n "$ENVFILE_NAME" ] && echo "$ENVFILE" > "$ENVFILE_NAME"
-			yarn install --production false
+			yarn --cwd "$YARN_CWD" install --production false
-			yarn run "$YARN_BUILD_SCRIPT"
+
+			opts=( $(echo $YARN_ARGS) )
+			yarn --cwd "$YARN_CWD" run "$YARN_BUILD_SCRIPT" ${opts[@]}
 			mv "$YARN_BUILD_DIRECTORY" /build
 			"""
 		"env": env & {
 			YARN_BUILD_SCRIPT:    script
+			YARN_ARGS:            strings.Join(args, "\n")
 			YARN_CACHE_FOLDER:    "/cache/yarn"
+			YARN_CWD:             cwd
 			YARN_BUILD_DIRECTORY: buildDir
 			if writeEnvFile != "" {
 				ENVFILE_NAME: writeEnvFile