test: add GitHub workflow to test codebase on each push to PR

.github/workflows/check.yaml

@@ -0,0 +1,25 @@
+name: "Check Codebase"
+
+on:
+  pull_request:
+  workflow_dispatch:
+
+jobs:
+  check:
+    runs-on: "ubuntu-latest"
+
+    steps:
+      - name: "Checkout Codebase"
+        uses: "actions/checkout@v4"
+
+      - name: "Install nix"
+        uses: "cachix/install-nix-action@v25"
+        with:
+          nix_path: "nixpkgs=channel:nixos-23.11"
+
+      - name: "Use magic Nix cache"
+        uses: "DeterminateSystems/magic-nix-cache-action@v3"
+
+      - name: "Check"
+        run: |
+          nix-shell --run "dev-test-build"