Europa: integrate core packages, separate universe

Signed-off-by: Solomon Hykes <solomon@dagger.io>

europa-universe/examples/README.md

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+## Dagger examples
+
+A collection of examples to help Dagger developers get started.

europa-universe/examples/todoapp/base.cue

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+// Deployment plan for Dagger's example todoapp
+package todoapp
+
+import (
+	"dagger.io/dagger"
+
+	"universe.dagger.io/git"
+	"universe.dagger.io/yarn"
+)
+
+dagger.#DAG & {
+	// Build the app with yarn
+	actions: build: yarn.#Build
+
+	// Wire up source code to build
+	{
+		input: directories: source: _
+		actions: build: source:     input.directories.source.contents
+	} | {
+		actions: {
+			pull: git.#Pull & {
+				remote: "https://github.com/mdn/todo-react"
+				ref:    "master"
+			}
+			build: source: pull.checkout
+		}
+	}
+}

europa-universe/examples/todoapp/dev/dev.cue

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+// Local dev environment for todoapp
+package todoapp
+
+import (
+	"universe.dagger.io/docker"
+	"universe.dagger.io/nginx"
+)
+
+// Expose todoapp web port
+proxy: web: _
+
+actions: {
+	// Reference app build inherited from base config
+	build: _
+	_app:  build.output
+
+	container: {
+		// Build a container image serving the app with nginx
+		build: docker.#Build & {
+			steps: [
+				nginx.#Build & {
+					flavor: "alpine"
+				},
+				docker.#Copy & {
+					contents: _app
+					dest:     "/usr/share/nginx/html"
+				},
+			]
+		}
+
+		// Run the app in an ephemeral container
+		run: docker.#Run & {
+			image: build.output
+			ports: web: {
+				frontend: proxy.web.endpoint
+				backend: address: "localhost:5000"
+			}
+		}
+	}
+}

europa-universe/examples/todoapp/staging/staging.cue

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+// Deploy to Netlify
+package todoapp
+
+import (
+	"universe.dagger.io/netlify"
+)
+
+// Netlify API token
+input: secrets: netlify: _
+
+// Must be a valid branch/PR name
+environment: string
+
+actions: {
+
+	// Yarn build inherited from base config
+	build: _
+
+	deploy: netlify.#Deploy & {
+		contents: build.output
+		token:    input.secrets.netlify.contents
+		site:     *"acme-inc-\(environment)" | string
+		team:     *"acme-inc" | string
+	}
+}