ci(gh-actions): Add workflow to test the mcl command

Author: PetarKirov

.github/workflows/mcl.yml

@@ -0,0 +1,36 @@
+name: 'MCL'
+
+on:
+  # Allow this workflow to be triggered manually:
+  workflow_dispatch:
+
+  # Allow this workflow to be triggered in merge
+  merge_group:
+
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - main
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.repository }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  test-mcl:
+    runs-on: self-hosted
+    steps:
+      - name: Install Nix
+        uses: metacraft-labs/nixos-modules/.github/install-nix@main
+        with:
+          cachix-cache: ${{ vars.CACHIX_CACHE }}
+          cachix-auth-token: ${{ secrets.CACHIX_AUTH_TOKEN }}
+          trusted-public-keys: ${{ vars.TRUSTED_PUBLIC_KEYS }}
+          substituters: ${{ vars.SUBSTITUTERS }}
+
+      - uses: actions/checkout@v4
+
+      - name: Build and test the `mcl` command
+        run: nix develop -c sh -c "dub test --root packages/mcl -- -e 'fetchJson|(coda\.)|nix.run|nix.build'"