Thorough integration tests for commits to master.

.github/workflows/ci++.yml

@@ -0,0 +1,18 @@
+name: Thorough C++ CI Integration Tests
+
+on:
+  push:
+    branches: [ "main" ]
+
+jobs:
+  verify_thorough:
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v3
+    - name: make
+      run: make
+    - name: jellyfish
+      run: sudo apt install jellyfish
+    - name: verify
+      run: make verify