Add auto-deploy of microsite to GH Pages 🐙 (#67)

Co-authored-by: Juan Valencia <juanvalencia@calvellido.es>

.github/workflows/deploy.yml

@@ -0,0 +1,28 @@
+name: Deploy
+on:
+  push:
+    branches:
+    - master
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v1
+    - uses: mstksg/setup-stack@v1
+    - name: Generate Haddock Docs
+      run: bash ./generate-haddock-docs.sh
+    - name: Get Bundle & Jekyll
+      run: |
+        sudo apt-get update
+        sudo apt-get install ruby-dev
+        sudo gem install bundler --force
+        sudo gem update --system
+        sudo bundle install --gemfile docs/Gemfile --path vendor/bundle
+    - name: Build microsite
+      run: BUNDLE_GEMFILE=./docs/Gemfile bundle exec jekyll build -b /mu-haskell -s docs -d gen-docs
+    - name: Deploy microsite
+      uses: peaceiris/actions-gh-pages@v2
+      env:
+        ACTIONS_DEPLOY_KEY: ${{ secrets.ACTIONS_DEPLOY_KEY }}
+        PUBLISH_BRANCH: gh-pages
+        PUBLISH_DIR: ./gen-docs

.github/workflows/haskell.yml

@@ -1,5 +1,5 @@
 name: Haskell CI
-on: [push]
+on: [pull_request]
 jobs:
   build:
     runs-on: ubuntu-latest