Fix Linux glibc compatibility by switching to musl static builds

- Switch Linux release targets from gnu to musl (x86_64 and aarch64)
- Add musl-tools install step in release workflow
- Update install.sh to download musl binaries on Linux
- Add install_private.sh to .gitignore

Musl produces fully static binaries with no glibc dependency,
ensuring compatibility across all Linux distros (Ubuntu 22.04+, etc).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: stephenleo

.github/workflows/release.yml

@@ -38,16 +38,19 @@ jobs:
             runner: macos-latest
           - target: x86_64-apple-darwin
             runner: macos-latest
-          - target: x86_64-unknown-linux-gnu
+          - target: x86_64-unknown-linux-musl
             runner: ubuntu-latest
-          - target: aarch64-unknown-linux-gnu
+          - target: aarch64-unknown-linux-musl
             runner: ubuntu-24.04-arm
     steps:
       - uses: actions/checkout@v4
       - name: Install Rust stable
         uses: dtolnay/rust-toolchain@stable
         with:
           targets: ${{ matrix.target }}
+      - name: Install musl tools (Linux)
+        if: contains(matrix.target, 'linux-musl')
+        run: sudo apt-get install -y musl-tools
       - uses: Swatinem/rust-cache@v2
       - name: Build release binary
         run: cargo build --release --target ${{ matrix.target }}

.gitignore

@@ -7,4 +7,5 @@ _bmad*
 /target
 starship.toml
 
-.vscode/
+.vscode/
+install_private.sh

install.sh

@@ -19,8 +19,8 @@ case "$OS" in
     ;;
   Linux)
     case "$ARCH" in
-      x86_64)  TARGET="x86_64-unknown-linux-gnu" ;;
-      aarch64) TARGET="aarch64-unknown-linux-gnu" ;;
+      x86_64)  TARGET="x86_64-unknown-linux-musl" ;;
+      aarch64) TARGET="aarch64-unknown-linux-musl" ;;
       *)       echo "Unsupported Linux arch: $ARCH" >&2; exit 1 ;;
     esac
     ;;