Add github workflow

.github/workflows/main.yml

@@ -0,0 +1,22 @@
+name: CI
+on: [push, pull_request]
+
+jobs:
+  build:
+    name: Build
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-24.04]
+        lua: [lua54]
+    steps:
+      - uses: actions/checkout@main
+      - uses: dtolnay/rust-toolchain@stable
+      - name: Install ${{ matrix.lua }} module
+        run: |
+          sudo apt update
+          sudo apt install -y git curl luarocks lua5.4 liblua5.4-dev
+          luarocks-5.4 --local install luarocks-build-rust-mlua-dev-1.rockspec
+          cargo -V
+          luarocks-5.4 --local install lua-ryaml
+        shell: bash