Add GitHub Actions workflow

.github/workflows/test.yml

@@ -0,0 +1,26 @@
+name: CI
+
+on:
+  pull_request:
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        emacs_version:
+          - 29.1
+    steps:
+    - name: Set up Emacs
+      uses: purcell/setup-emacs@master
+      with:
+        version: ${{matrix.emacs_version}}
+
+    - name: Check out the source code
+      uses: actions/checkout@v3
+
+    - name: Check the project
+      run: |
+        emacs --version
+        emacs -Q --batch --eval "(require 'package)" --eval "(setq package-archives '((\"melpa\" . \"https://melpa.org/packages/\") (\"gnu\" . \"https://elpa.gnu.org/packages/\")))" --funcall package-initialize --funcall package-refresh-contents --eval "(package-install 'package-lint)" --eval "(package-install 'buttercup)"
+        cd test && bash ./run-tests.sh

README.org

@@ -1,10 +1,12 @@
 * makel
 
-#+begin_export html
-<a href="https://drone.petton.fr/DamienCassou/makel">
-  <img src="https://drone.petton.fr/api/badges/DamienCassou/makel/status.svg" />
-</a>
-#+end_export
+  #+BEGIN_HTML
+      <p>
+        <a href="https://github.com/DamienCassou/makel/actions">
+          <img alt="pipeline status" src="https://github.com/DamienCassou/makel/actions/workflows/test.yml/badge.svg" />
+        </a>
+      </p>
+  #+END_HTML
 
 ** Summary