Europa docs: From local dev to CI environment doc page

The todoapp example contains a Netlify plan which uses the latest dagger
additions: do & Client API. We are thinking of merging the examples
repository into this one to make working with this easier. This is a
step in that direction.

We are not using the yarn package so that we can revert
https://github.com/dagger/dagger/pull/1673 without breaking this
implementation.

The GitHub Action is WIP, we will continue with that tomorrow:
https://github.com/dagger/dagger-for-github/issues/24

Signed-off-by: Gerhard Lazu <gerhard@lazu.co.uk>

.github/workflows/todoapp.yml

@@ -0,0 +1,42 @@
+name: todoapp
+
+on:
+  push:
+    branches:
+      - main
+    paths:
+      - '.github/workflows/todoapp.yml'
+      - 'pkg/universe.dagger.io/examples/todoapp/**'
+
+env:
+  # This needs to be unique across all of Netlify
+  APP_NAME: todoapp-dagger-europa
+  NETLIFY_TEAM: blocklayer
+  # https://app.netlify.com/user/applications/personal
+  NETLIFY_TOKEN: ${{ secrets.NETLIFY_TOKEN }}
+  DAGGER_LOG_FORMAT: plain
+
+jobs:
+  dagger:
+    name: "Deploy todoapp to Netlify"
+    runs-on: ubuntu-latest
+    steps:
+      - name: "Clone repository"
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+
+      # TODO: maybe use Dagger action post 0.2.0-beta.1
+      - name: "Setup Go"
+        uses: actions/setup-go@v1
+        with:
+          go-version: 1.16
+
+      - name: "Install dev Dagger"
+        run: |
+          make dagger
+
+      - name: "Dagger"
+        run: |
+          cd pkg/universe.dagger.io/examples/todoapp
+          ${{ github.workspace }}/cmd/dagger/dagger do deploy