Create PR github workflow

This workflow only runs the build, but does not publish.

Author: jnavila

.github/workflows/PR.yml

@@ -0,0 +1,43 @@
+# This is a basic workflow to help you get started with Actions
+
+name: PR
+
+# Controls when the action will run. 
+on:
+  # Triggers the workflow on push or pull request events but only for the master branch
+  pull_request:
+    branches: [ master ]
+
+  # Allows you to run this workflow manually from the Actions tab
+  workflow_dispatch:
+
+# A workflow run is made up of one or more jobs that can run sequentially or in parallel
+jobs:
+  # This workflow contains a single job called "build"
+  build:
+    # The type of runner that the job will run on
+    runs-on: ubuntu-latest
+
+    # Steps represent a sequence of tasks that will be executed as part of the job
+    steps:
+      # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
+      - uses: actions/checkout@v2
+      - name: Set up Ruby
+    # To automatically get bug fixes and new Ruby versions for ruby/setup-ruby,
+    # change this to (see https://github.com/ruby/setup-ruby#versioning):
+    # uses: ruby/setup-ruby@v1
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: 2.6
+
+      # Runs a single command using the runners shell
+      - name: before install
+        run: |
+          wget https://raw.githubusercontent.com/progit/progit2-pub/master/bootstrap.sh
+          sh bootstrap.sh
+          bundle install
+      - name: build book
+        env:
+          GITHUB_VERSION: "v0.0.0"
+        run: |
+          bundle exec rake book:build_action