add release and build workflow

Author: externref

.github/workflows/build.yml

@@ -0,0 +1,104 @@
+name: Build Rust Binaries
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+  release:
+    types: [published]
+  workflow_dispatch:
+
+jobs:
+  build:
+    name: Build for ${{ matrix.target }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        include:
+          - os: ubuntu-latest
+            target: x86_64-unknown-linux-gnu
+            artifact_name: externkit
+            asset_name: externkit-linux-x86_64
+          - os: windows-latest
+            target: x86_64-pc-windows-msvc
+            artifact_name: externkit.exe
+            asset_name: externkit-windows-x86_64.exe
+          - os: macos-latest
+            target: x86_64-apple-darwin
+            artifact_name: externkit
+            asset_name: externkit-macos-x86_64
+          - os: macos-latest
+            target: aarch64-apple-darwin
+            artifact_name: externkit
+            asset_name: externkit-macos-aarch64
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Install Rust
+        uses: dtolnay/rust-toolchain@stable
+        with:
+          targets: ${{ matrix.target }}
+
+      - name: Cache cargo registry
+        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 binary
+        run: cargo build --release --target ${{ matrix.target }}
+
+      - name: Strip binary (Linux and macOS)
+        if: matrix.os != 'windows-latest'
+        run: strip target/${{ matrix.target }}/release/${{ matrix.artifact_name }}
+
+      - name: Upload artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: ${{ matrix.asset_name }}
+          path: target/${{ matrix.target }}/release/${{ matrix.artifact_name }}
+
+  release:
+    name: Create Release
+    needs: build
+    runs-on: ubuntu-latest
+    if: github.event_name == 'release'
+    
+    steps:
+      - name: Download all artifacts
+        uses: actions/download-artifact@v4
+        with:
+          path: artifacts
+
+      - name: Display structure of downloaded files
+        run: ls -R artifacts
+
+      - name: Create compressed archives
+        run: |
+          cd artifacts
+          for dir in */; do
+            cd "$dir"
+            if [[ "$dir" == *"windows"* ]]; then
+              zip "../${dir%/}.zip" *
+            else
+              tar -czf "../${dir%/}.tar.gz" *
+            fi
+            cd ..
+          done
+
+      - name: Upload release assets
+        uses: softprops/action-gh-release@v1
+        with:
+          files: |
+            artifacts/*.zip
+            artifacts/*.tar.gz
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}