Enable GitHub workflows

.github/workflows/makefile.yml

@@ -0,0 +1,23 @@
+name: C/C++ CI
+
+on:
+  push:
+    branches: [ "master" ]
+  pull_request:
+    branches: [ "master" ]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v3
+    # - name: configure
+    #   run: ./configure
+    - name: make
+      run: make
+    # - name: make check
+    #   run: make check
+    # - name: make distcheck
+    #   run: make distcheck