feat: add GitHub Actions workflow for building and testing

.github/workflows/build.yml

@@ -0,0 +1,68 @@
+name: Build and Test
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+  release:
+    types: [published]
+
+jobs:
+  build:
+    name: Build
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        include:
+          - os: ubuntu-latest
+            target: x86_64-unknown-linux-gnu
+            artifact_name: gemini-keychecker
+            release_name: gemini-keychecker-linux-x86_64
+          - os: windows-latest
+            target: x86_64-pc-windows-msvc
+            artifact_name: gemini-keychecker.exe
+            release_name: gemini-keychecker-windows-x86_64.exe
+
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v4
+
+    - name: Install Rust toolchain
+      uses: dtolnay/rust-toolchain@stable
+      with:
+        targets: ${{ matrix.target }}
+
+    - name: Cache cargo dependencies
+      uses: actions/cache@v4
+      with:
+        path: |
+          ~/.cargo/registry
+          ~/.cargo/git
+          target
+        key: ${{ runner.os }}-cargo-${{ hashFiles('**/Cargo.lock') }}
+        restore-keys: |
+          ${{ runner.os }}-cargo-
+
+    - name: Build project
+      run: cargo build --release --target ${{ matrix.target }}
+
+    - name: Run tests
+      run: cargo test --target ${{ matrix.target }}
+
+    - name: Upload artifacts
+      uses: actions/upload-artifact@v4
+      with:
+        name: ${{ matrix.release_name }}
+        path: target/${{ matrix.target }}/release/${{ matrix.artifact_name }}
+
+    - name: Upload release assets
+      if: github.event_name == 'release'
+      uses: actions/upload-release-asset@v1
+      env:
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+      with:
+        upload_url: ${{ github.event.release.upload_url }}
+        asset_path: target/${{ matrix.target }}/release/${{ matrix.artifact_name }}
+        asset_name: ${{ matrix.release_name }}
+        asset_content_type: application/octet-stream