chore: Automatically update acir artifacts (#2454)

Co-authored-by: Tom French <[email protected]>
Co-authored-by: Tom French <[email protected]>

.github/workflows/auto-pr-rebuild-script.yml

@@ -0,0 +1,82 @@
+name: Automatically rebuild ACIR artifacts
+
+on:
+  push:
+    branches:
+      - master
+
+jobs:
+  build-nargo:
+    runs-on: ubuntu-22.04
+    strategy:
+      matrix:
+        target: [x86_64-unknown-linux-gnu]
+
+    steps:
+      - name: Checkout Noir repo
+        uses: actions/checkout@v4
+
+      - name: Setup toolchain
+        uses: dtolnay/[email protected]
+
+      - uses: Swatinem/rust-cache@v2
+        with:
+          key: ${{ matrix.target }}
+          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@v3
+        with:
+          name: nargo
+          path: ./dist/*
+          retention-days: 3
+
+  auto-pr-rebuild-script:
+    needs: [build-nargo]
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Check out code
+        uses: actions/checkout@v2
+
+      - name: Download nargo binary
+        uses: actions/download-artifact@v3
+        with:
+          name: nargo
+          path: ./nargo
+
+      - name: Add Nargo to $PATH
+        run: |
+          chmod +x ${{ github.workspace }}/nargo/nargo
+          echo "${{ github.workspace }}/nargo" >> $GITHUB_PATH
+
+      - name: Set up Git user (Github Action)
+        run: |
+          git config --local user.email "[email protected]"
+          git config --local user.name "GitHub Action"
+
+      - name: Run rebuild script
+        working-directory: tooling/nargo_cli/tests
+        run: |
+          chmod +x ./rebuild.sh
+          ./rebuild.sh
+
+      - name: Create or Update PR
+        uses: peter-evans/create-pull-request@v3
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          commit-message: "chore: update acir artifacts"
+          title: "chore: Update ACIR artifacts"
+          body: "Automatic PR to update acir artifacts"
+          labels: "auto-pr"
+          branch: "auto-pr-rebuild-script-branch"