fix(ci): use cross for ARM64 Linux builds

Cross-compilation for aarch64-unknown-linux-gnu requires OpenSSL
dev libraries for the target platform. Using `cross` handles this
automatically via Docker containers with pre-installed dependencies.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.github/workflows/release.yml

@@ -7,6 +7,8 @@ on:
 
 env:
   CARGO_TERM_COLOR: always
+  CARGO_HOME: /home/runner/.cargo
+  CARGO_INCREMENTAL: 0
 
 jobs:
   build:
@@ -15,12 +17,16 @@ jobs:
         include:
           - target: x86_64-apple-darwin
             os: macos-latest
+            use_cross: false
           - target: aarch64-apple-darwin
             os: macos-latest
+            use_cross: false
           - target: x86_64-unknown-linux-gnu
             os: ubuntu-latest
+            use_cross: false
           - target: aarch64-unknown-linux-gnu
             os: ubuntu-latest
+            use_cross: true
 
     runs-on: ${{ matrix.os }}
 
@@ -32,21 +38,32 @@ jobs:
         with:
           targets: ${{ matrix.target }}
 
-      - name: Install cross-compilation tools
-        if: matrix.target == 'aarch64-unknown-linux-gnu'
+      - name: Install cross
+        if: matrix.use_cross
+        run: cargo install cross --git https://github.com/cross-rs/cross
+
+      - name: Install dependencies (Linux)
+        if: matrix.os == 'ubuntu-latest' && !matrix.use_cross
         run: |
           sudo apt-get update
-          sudo apt-get install -y gcc-aarch64-linux-gnu
+          sudo apt-get install -y libssl-dev pkg-config
 
-      - name: Build MCP Server
+      - name: Build MCP Server (native)
+        if: "!matrix.use_cross"
         run: |
           cargo build --release --package vestige-mcp --target ${{ matrix.target }}
 
+      - name: Build MCP Server (cross)
+        if: matrix.use_cross
+        run: |
+          cross build --release --package vestige-mcp --target ${{ matrix.target }}
+
       - name: Package
         run: |
           mkdir -p dist
           cp target/${{ matrix.target }}/release/vestige-mcp dist/
-          cd dist && tar czf vestige-mcp-${{ matrix.target }}.tar.gz vestige-mcp
+          cp target/${{ matrix.target }}/release/vestige dist/ || true
+          cd dist && tar czf vestige-mcp-${{ matrix.target }}.tar.gz vestige-mcp vestige 2>/dev/null || tar czf vestige-mcp-${{ matrix.target }}.tar.gz vestige-mcp
 
       - name: Upload artifact
         uses: actions/upload-artifact@v4