Add workflow

.github/workflows/main.yml

@@ -0,0 +1,33 @@
+# This is a basic workflow to help you get started with Actions
+
+name: CI
+
+# Controls when the action will run. Triggers the workflow on push or pull request
+# events but only for the master branch
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+# 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/[email protected]
+
+    - name: Install emacs
+      run: sudo apt-get install -y emacs
+
+    - name: Tangle and check
+      run: |
+        cp papis.el papis.el.bak
+        emacs -Q --batch --eval "(require 'ob-tangle)" README.org -f org-babel-tangle
+        test -f papis.el
+        diff papis.el papis.el.bak