start building out github-actions (#55)

Summary: Pull Request resolved: #55

Test Plan: https://github.com/shayne-fletcher/ocamlrep/actions/runs/7548585799

Reviewed By: dtolnay

Differential Revision: D52818349

Pulled By: shayne-fletcher

fbshipit-source-id: c77117139a410ff527476ca49295f27ecf161f22

.github/workflows/cargo-build-and-test.yml

@@ -0,0 +1,15 @@
+name: Cargo build and test
+on:
+  push:
+  pull_request:
+jobs:
+  linux-cargo-build-and-test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: Swatinem/rust-cache@v2
+      - run: sudo apt-get update && sudo apt-get install libssl-dev cmake clang lld opam zstd
+      - run: opam init --compiler=5.1.1 --disable-sandboxing -y
+      - run: eval $(opam env) && ./ocaml-setup.sh
+      - run: cargo build
+      - run: cargo test