Create GA workflow

Author: Unisay

.github/workflows/ci.yaml

@@ -0,0 +1,27 @@
+name: Purescript Lua CI
+on:
+  pull_request:
+  push:
+jobs:
+  tests:
+    runs-on: ubuntu-latest
+    steps:
+    - name: "📥 Checkout repository"
+      uses: actions/checkout@v3
+
+    - name: "❄ Install Nix"
+      uses: cachix/install-nix-action@v22
+      with:
+        github_access_token: ${{ secrets.GITHUB_TOKEN }}
+        extra_nix_config: |
+          access-tokens = github.com=${{ secrets.GITHUB_TOKEN }}
+          substituters = https://hydra.iohk.io https://cache.nixos.org/
+          trusted-public-keys = hydra.iohk.io:f/Ea+s+dFdN+3Y/G+FDgSq+a5NEWhJGzdjvKNGv0/EQ= cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY=
+
+    - uses: cachix/cachix-action@v12
+      with:
+        name: purescript-lua
+        authToken: "${{ secrets.CACHIX_AUTH_TOKEN }}"
+
+    - name: "🔨 Build & test"
+      run: nix develop -c cabal test all --test-show-details=direct