examples/jamstack: added support for frontend (netlify)

Signed-off-by: Sam Alba <sam.alba@gmail.com>

examples/jamstack/frontend.cue

@@ -0,0 +1,52 @@
+package main
+
+import (
+	"dagger.io/dagger"
+	"dagger.io/netlify"
+	"dagger.io/js/react"
+)
+
+frontend: {
+	// Source code to build the app
+	source: dagger.#Artifact
+
+	writeEnvFile?: string
+
+	// Yarn Build
+	yarn: {
+		// Run this yarn script
+		script: string | *"build"
+
+		// Read build output from this directory
+		// (path must be relative to working directory).
+		buildDir: string | *"build"
+	}
+
+	// Build environment variables
+	environment: [string]: string
+	environment: NODE_ENV: string | *"production"
+	environment: APP_URL:  "https://\(name).netlify.app/"
+}
+
+frontend: {
+	app: react.#App & {
+		source: frontend.source
+		env:    frontend.environment
+
+		if frontend.writeEnvFile != _|_ {
+			writeEnvFile: frontend.writeEnvFile
+		}
+
+		yarn: {
+			script:   frontend.yarn.script
+			buildDir: frontend.yarn.buildDir
+		}
+	}
+
+	// Host the application with Netlify
+	site: netlify.#Site & {
+		"name":   name
+		account:  infra.netlifyAccount
+		contents: app.build
+	}
+}

examples/jamstack/infra.cue

@@ -2,6 +2,7 @@ package main
 
 import (
 	"dagger.io/aws"
+	"dagger.io/netlify"
 )
 
 infra: {
@@ -28,4 +29,7 @@ infra: {
 
 	// ARN of the RDS Instance
 	rdsInstanceArn: string
+
+	// Netlify credentials
+	netlifyAccount: netlify.#Account
 }

examples/jamstack/main.cue

@@ -3,9 +3,6 @@ package main
 // Name of the application
 name: string & =~"[a-z0-9-]+"
 
-// FIXME: temporary workaround (GH issue #142) - image metadata is lost after build
-backend: container: command: ["/bin/hello-go"]
-
 // Inject db info in the container environment
 backend: environment: {
 	DB_USERNAME: database.username
@@ -16,7 +13,10 @@ backend: environment: {
 	DB_TYPE:     database.dbType
 }
 
+// Configure the frontend with the API URL
+frontend: environment: APP_URL_API: url.backendURL
+
 url: {
-	frontendURL: "FIXME"
+	frontendURL: frontend.site.url
 	backendURL:  "https://\(backend.hostname)/"
 }