add CI with github workflow

.github/workflows/validate_operations.yml

@@ -0,0 +1,79 @@
+name: Validate Operations
+
+env:
+  LLVM_COMMIT: 0c2701fe7fa002e1befc5f86c268a7964f96d286
+
+on:
+  push:
+  pull_request:
+
+jobs:
+  validate:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+        with:
+          submodules: recursive
+
+      - name: Install system dependencies
+        run: |
+          sudo apt update
+          sudo apt install -y cmake ninja-build build-essential protobuf-compiler
+
+      - name: Install Rust toolchain
+        uses: dtolnay/rust-toolchain@stable
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.12"
+
+      - name: Install Python dependencies
+        run: pip install numpy onnx colorama
+
+      - name: Clone LLVM
+        run: |
+          git clone -n https://github.com/llvm/llvm-project.git onnx-mlir/llvm-project
+          cd onnx-mlir/llvm-project && git checkout ${{ env.LLVM_COMMIT }}
+
+      - name: Cache MLIR build
+        id: cache-mlir
+        uses: actions/cache@v4
+        with:
+          path: onnx-mlir/llvm-project/build
+          key: mlir-${{ runner.os }}-${{ env.LLVM_COMMIT }}
+
+      - name: Build MLIR
+        if: steps.cache-mlir.outputs.cache-hit != 'true'
+        run: |
+          mkdir -p onnx-mlir/llvm-project/build
+          cd onnx-mlir/llvm-project/build
+          cmake -G Ninja ../llvm \
+            -DLLVM_ENABLE_PROJECTS="mlir;clang" \
+            -DLLVM_ENABLE_RUNTIMES="openmp" \
+            -DLLVM_TARGETS_TO_BUILD="host" \
+            -DCMAKE_BUILD_TYPE=Release \
+            -DLLVM_ENABLE_ASSERTIONS=ON \
+            -DLLVM_ENABLE_RTTI=ON \
+            -DENABLE_LIBOMPTARGET=OFF \
+            -DLLVM_ENABLE_LIBEDIT=OFF
+          cmake --build .
+
+      - name: Build Raptor
+        run: |
+          MLIR_DIR=$(pwd)/onnx-mlir/llvm-project/build/lib/cmake/mlir
+          mkdir -p build && cd build
+          cmake .. -G Ninja \
+            -DCMAKE_BUILD_TYPE=Debug \
+            -DONNX_MLIR_ACCELERATORS=PIM \
+            -DLLVM_ENABLE_ASSERTIONS=ON \
+            -DMLIR_DIR=${MLIR_DIR}
+          cmake --build .
+
+      - name: Run validation
+        run: |
+          python validate.py \
+            --raptor-path build/Debug/bin/onnx-mlir \
+            --onnx-include-dir onnx-mlir/include