Adds GitHub presubmit checks.

Author: jacobaustin123

.github/workflows/test.yml

@@ -0,0 +1,41 @@
+name: Tests
+
+on:
+  push:
+    branches: [master]
+  pull_request:
+    branches: [master]
+
+jobs:
+  test:
+    runs-on: ubuntu-24.04
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Install LLVM 19
+        run: |
+          wget https://apt.llvm.org/llvm.sh
+          chmod +x llvm.sh
+          sudo ./llvm.sh 19
+          sudo apt-get install -y llvm-19-dev
+          echo "/usr/lib/llvm-19/bin" >> $GITHUB_PATH
+
+      - name: Setup OCaml
+        uses: ocaml/setup-ocaml@v3
+        with:
+          ocaml-compiler: "5.2.x"
+
+      - name: Install dependencies
+        run: |
+          opam install -y llvm ocamlbuild ocamlfind
+
+      - name: Build
+        run: |
+          eval $(opam env)
+          make
+
+      - name: Run tests
+        run: |
+          eval $(opam env)
+          make test