Add github actions tutorial

Signed-off-by: Tihomir Jovicic <tihomir.jovicic.develop@gmail.com>

docs/learn/109-github-actions.md

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+---
+slug: /learn/109-github-actions
+---
+
+# Dagger 109: integrate with Github Actions
+
+This tutorial illustrates how to use Github Actions and Dagger to build, push and deploy Docker images to Cloud Run.
+
+import Tabs from '@theme/Tabs';
+import TabItem from '@theme/TabItem';
+
+## Prerequisites
+
+We assume that you've finished our 106-cloudrun tutorial as this one continues right after.
+
+## Setup new Github repo 
+
+Push existing `examples/todoapp` directory to your new Github repo (public or private). It should contain all the code 
+from `https://github.com/dagger/examples/tree/main/todoapp`, `gcpcloudrun` and `.dagger/env/gcpcloudrun/` directory. 
+
+### Add Github Actions Secret
+
+Dagger encrypts all input secrets using your key stored at `~/.config/dagger/keys.txt`. Copy the entire line starting
+with `AGE-SECRET-KEY-` and save it to a Github secret named `DAGGER_AGE_KEY`. In case you don't know how to create
+secrets on Github take a look at [this tutorial](https://docs.github.com/en/actions/reference/encrypted-secrets).
+
+## Create a Github Actions Workflow
+
+Create `.github/workflows/gcpcloudrun.yml` file and paste the following code into it:
+
+```yaml title=".github/workflows/gcpcloudrun.yml"
+name: CloudRun
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v2
+      - name: Dagger
+        uses: dagger/dagger-action@v1
+        with:
+          age-key: ${{ secrets.DAGGER_AGE_KEY }}
+          args: up -e gcpcloudrun
+```
+
+## Run
+
+On any push to `main` branch this workflow should run and deploy the `todoapp` to your GCP Cloud Run instance.

examples/cloudrun-app/main.cue

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-package main
-
-import (
-	"dagger.io/gcp"
-	"dagger.io/gcp/cloudrun"
-)
-
-// Cloud Run service name
-serviceName: *"cloudrun-test" | string @dagger(input)
-
-// Image name
-image: string @dagger(input)
-
-gcpConfig: gcp.#Config
-
-deploy: cloudrun.#Deploy & {
-	"serviceName": serviceName
-	"image":       image
-	config:        gcpConfig
-}