Add action to build SeBa

On every change to main (push or pull request), build SeBa to see if that still works. If not, the PR should not be merged / the push should be amended.

Author: rieder

.github/workflows/build.yml

@@ -0,0 +1,21 @@
+name: Build SeBa
+
+on:
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "main" ]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v4
+    - name: make
+      run: make
+    - name: make dstar
+      run: 
+        cd dstar
+        make