feat: use musl binary (#10)

Author: imos

.github/workflows/release.yml

@@ -36,11 +36,11 @@ jobs:
       matrix:
         include:
           - os: ubuntu-latest
-            target: x86_64-unknown-linux-gnu
+            target: x86_64-unknown-linux-musl
             arch_name: linux_amd64
             ext: tar.gz
           - os: ubuntu-latest
-            target: aarch64-unknown-linux-gnu
+            target: aarch64-unknown-linux-musl
             arch_name: linux_arm64
             ext: tar.gz
           - os: macos-latest
@@ -67,29 +67,33 @@ jobs:
         with:
           targets: ${{ matrix.target }}
 
-      - name: Install aarch64 linux toolchain
-        if: matrix.target == 'aarch64-unknown-linux-gnu'
-        run: |
-          sudo apt-get update
-          sudo apt-get install -y gcc-aarch64-linux-gnu
+      - name: Install cross
+        if: runner.os == 'Linux'
+        uses: taiki-e/install-action@v2
+        with:
+          tool: cross
 
-      - name: Configure aarch64 linux linker
-        if: matrix.target == 'aarch64-unknown-linux-gnu'
+      - name: Build release (Linux musl)
+        if: runner.os == 'Linux'
         run: |
-          mkdir -p .cargo
-          cat > .cargo/config.toml <<'EOF'
-          [target.aarch64-unknown-linux-gnu]
-          linker = "aarch64-linux-gnu-gcc"
-          ar = "aarch64-linux-gnu-ar"
-          EOF
-          echo "CC_aarch64_unknown_linux_gnu=aarch64-linux-gnu-gcc" >> "$GITHUB_ENV"
-          echo "AR_aarch64_unknown_linux_gnu=aarch64-linux-gnu-ar" >> "$GITHUB_ENV"
-          echo "CARGO_TARGET_AARCH64_UNKNOWN_LINUX_GNU_LINKER=aarch64-linux-gnu-gcc" >> "$GITHUB_ENV"
+          cross build --release --locked --target ${{ matrix.target }}
 
       - name: Build release
+        if: runner.os != 'Linux'
         run: |
           cargo build --release --locked --target ${{ matrix.target }}
 
+      - name: Verify Linux binary is fully static
+        if: runner.os == 'Linux'
+        shell: bash
+        run: |
+          set -euxo pipefail
+          BIN="target/${{ matrix.target }}/release/sshpod"
+          readelf -d "$BIN" > dynamic-deps.txt
+          ! grep -F "Shared library:" dynamic-deps.txt
+          readelf -l "$BIN" > program-headers.txt
+          ! grep -F "Requesting program interpreter" program-headers.txt
+
       - name: Verify dynamic dependencies (unix)
         if: runner.os != 'Windows'
         shell: bash