Replace Travis-CI with GitHub Workflows

Author: stephenmathieson

.github/workflows/ci.yml

@@ -0,0 +1,24 @@
+name: Test
+
+on: [push]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        compiler: [gcc, clang]
+    steps:
+      - uses: actions/checkout@v4
+      - run: |
+          sudo apt-get update
+          sudo apt-get install -y build-essential
+      - env:
+          CC: ${{ matrix.compiler }}
+        run: make test
+
+  test-macos:
+    runs-on: macos-latest
+    steps:
+      - uses: actions/checkout@v4
+      - run: make test