Set up GitHub Actions to build and test P4MLIR (#2)

Signed-off-by: Bili Dong <qobilidop@gmail.com>

.github/workflows/build-and-test.yml

@@ -0,0 +1,67 @@
+name: build-and-test
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+# Cancel any preceding run on the pull request.
+concurrency:
+  group: p4mlir-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: ${{ github.ref != 'refs/heads/main' }}
+
+jobs:
+  build-and-test:
+    runs-on: ubuntu-20.04
+
+    steps:
+
+    - name: Checkout repo
+      uses: actions/checkout@v4
+      with:
+        submodules: recursive
+
+    - name: Enable ccache
+      uses: hendrikmuhs/ccache-action@v1.2
+      with:
+        key: ${{ runner.os }}
+
+    # --------
+    # Build and test MLIR. Use cache when available.
+    # --------
+
+    - name: Get LLVM hash
+      id: get-llvm-hash
+      run: echo "hash=$(git rev-parse @:./third_party/llvm-project)" >> $GITHUB_OUTPUT
+
+    - name: Get workflow hash
+      id: get-workflow-hash
+      run: echo "hash=$(md5sum $GITHUB_WORKSPACE/.github/workflows/build-and-test.yml | awk '{print $1}')" >> $GITHUB_OUTPUT
+
+    - name: Cache LLVM
+      id: cache-llvm
+      uses: actions/cache@v3
+      with:
+        path: |
+          third_party/llvm-project/build/bin/llvm-lit
+          install
+        key: ${{ runner.os }}-llvm-${{ steps.get-llvm-hash.outputs.hash }}-${{ steps.get-workflow-hash.outputs.hash }}
+
+    - name: Install requirements
+      if: steps.cache-llvm.outputs.cache-hit != 'true'
+      run: |
+        build_tools/ubuntu_install_mlir_requirements.sh
+
+    - name: Build and test MLIR
+      if: steps.cache-llvm.outputs.cache-hit != 'true'
+      run: |
+        build_tools/build_mlir.sh
+
+    # --------
+    # Build and test P4MLIR.
+    # --------
+
+    - name: Build and test P4MLIR
+      run: |
+        build_tools/build_p4mlir.sh

build_tools/ubuntu_install_mlir_requirements.sh

@@ -6,7 +6,8 @@
 
 set -ex
 
-apt-get install -y \
+sudo apt-get update
+sudo apt-get install -y \
     build-essential \
     ccache \
     clang \