chore(ci): add workflow to run nargo check on latest aztec-nr

.github/workflows/external-repo-tests.yml

@@ -0,0 +1,92 @@
+name: External Repo Tests
+
+on:
+  pull_request:
+  merge_group:
+  push:
+    branches:
+      - master
+
+# This will cancel previous runs when a branch or PR is updated
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref || github.ref || github.run_id }}
+  cancel-in-progress: true
+
+jobs:
+  build-nargo:
+    runs-on: ubuntu-22.04
+    timeout-minutes: 30
+
+    steps:
+      - name: Checkout Noir repo
+        uses: actions/checkout@v4
+
+      - name: Setup toolchain
+        uses: dtolnay/rust-toolchain@1.74.1
+
+      - uses: Swatinem/rust-cache@v2
+        with:
+          key: x86_64-unknown-linux-gnu
+          cache-on-failure: true
+          save-if: ${{ github.event_name != 'merge_group' }}
+
+      - name: Build Nargo
+        run: cargo build --package nargo_cli --release
+
+      - name: Package artifacts
+        run: |
+          mkdir dist
+          cp ./target/release/nargo ./dist/nargo
+          7z a -ttar -so -an ./dist/* | 7z a -si ./nargo-x86_64-unknown-linux-gnu.tar.gz
+
+      - name: Upload artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: nargo
+          path: ./dist/*
+          retention-days: 3
+
+  external-repo-checks:
+    needs: [build-nargo]
+    runs-on: ubuntu-latest
+    timeout-minutes: 30
+    strategy:
+      matrix:
+        project:
+         - { repo: AztecProtocol/aztec-nr, path: ./ }
+         # Disabled as aztec-packages requires a setup-step in order to generate a `Nargo.toml`
+         #- { repo: AztecProtocol/aztec-packages, path: ./noir-projects/noir-protocol-circuits }
+         - { repo: vlayer-xyz/monorepo, path: ./, ref: ee46af88c025863872234eb05d890e1e447907cb }
+
+    name: Check ${{ matrix.project.repo }}
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          repository: ${{ matrix.project.repo }}
+          fetch-depth: 1
+          path: test-repo
+          ref: ${{ matrix.project.ref }}
+
+      - name: Download nargo binary
+        uses: actions/download-artifact@v4
+        with:
+          name: nargo
+          path: ./nargo
+
+      - name: Set nargo on PATH
+        run: |
+          nargo_binary="${{ github.workspace }}/nargo/nargo"
+          chmod +x $nargo_binary
+          echo "$(dirname $nargo_binary)" >> $GITHUB_PATH
+          export PATH="$PATH:$(dirname $nargo_binary)"
+          nargo -V
+      
+      - name: Run nargo check
+        working-directory: ./test-repo/${{ matrix.project.path }}
+        run: nargo check
+
+      - name: Run nargo test
+        working-directory: ./test-repo/${{ matrix.project.path }}
+        run: nargo test