Setup CI action to automate testing

.github/workflows/main.yml

@@ -0,0 +1,76 @@
+name: Github Actions
+
+on: [push, pull_request]
+
+jobs:
+  host-x86-build:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        compiler: [gcc, clang]
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+      - name: Install prerequisite
+        uses: awalsh128/cache-apt-pkgs-action@latest
+        with:
+          packages: file build-essential clang
+          version: 1.0
+      - name: Build stage 1 artifact
+        env:
+          CC: ${{ matrix.compiler }}
+        run: |
+          make clean
+          make slimcc
+        shell: bash
+      - name: Test stage 1
+        run: |
+          make test || exit 1
+        shell: bash
+      - name: Build stage 2 artifact
+        run: |
+          make stage2/slimcc
+        shell: bash
+      - name: Test stage 2
+        run: |
+          make test-stage2 || exit 1
+        shell: bash
+      - run: mv slimcc slimcc-${{ matrix.compiler }}
+      - name: Upload artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: slimcc-${{ matrix.compiler }}
+          path: slimcc-${{ matrix.compiler }}
+
+  test-building-real-world-projects:
+    needs: host-x86-build
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        compiler: [gcc, clang]
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+      - name: Download artifact
+        uses: actions/download-artifact@v4
+        with:
+          name: slimcc-${{ matrix.compiler }}
+      - run: |
+          chmod +x slimcc-${{ matrix.compiler }}
+      - uses: lukka/get-cmake@latest  
+        with:
+          useLocalCache: true
+      - name: Install prerequisite
+        uses: awalsh128/cache-apt-pkgs-action@latest
+        with:
+          packages: file build-essential clang libssh2-1
+          version: 1.0
+      - name: Test Building curl 8.9.1
+        run: |
+          git clone --depth 1 https://github.com/curl/curl --branch curl-8_9_1
+          mkdir curl/cmakebuild
+          cd curl/cmakebuild
+          cmake ../ -DCMAKE_C_COMPILER=${GITHUB_WORKSPACE}/slimcc-${{ matrix.compiler }} -DCMAKE_C_FLAGS=-fPIC
+          make -j
+          make test-quiet -j
+        shell: bash