Add compiler building workflow

.github/workflows/dusk.yml

@@ -0,0 +1,53 @@
+# Instructions for GitHub to build Dusk's smart contract compilers.
+
+on:
+  pull_request:
+  push:
+    branches:
+      - master
+
+name: Dusk Contract Compilers
+
+jobs:
+  target:
+    strategy:
+      matrix:
+        os: [ ubuntu-latest, macos-latest ]
+        target: [
+          x86_64-unknown-linux-gnu,
+          x86_64-apple-darwin,
+          aarch64-apple-darwin,
+        ]
+        exclude:
+          - os: ubuntu-latest
+            target: x86_64-apple-darwin
+          - os: ubuntu-latest
+            target: aarch64-apple-darwin
+          - os: macos-latest
+            target: x86_64-unknown-linux-gnu
+    runs-on: ${{ matrix.os }}
+    steps:
+      - name: Check out repository
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 4
+
+      - name: Install dependencies
+        if: matrix.os == 'ubuntu-latest'
+        run: sudo apt update && sudo apt install -y ninja-build
+
+      - name: Install dependencies
+        if: matrix.os == 'macos-latest'
+        run: brew install ninja openssl@3
+
+      - name: Run build
+        run: ./x build --host ${{ matrix.target }}
+
+      - name: Archive build directory
+        run: tar -czvf duskc.tar.gz build/${{ matrix.target }}/stage2*
+
+      - name: Upload build
+        uses: actions/upload-artifact@v3
+        with:
+          name: duskc-${{ matrix.target }}-${{ github.sha }}
+          path: duskc.zip