fix: statically link prebuilt Linux binaries against musl

Fixes #300

Author: mvanhorn

.github/workflows/release-prebuilt-npm.yml

@@ -34,8 +34,10 @@ jobs:
         include:
           - package_name: hunkdiff-linux-arm64
             runner: ubuntu-24.04-arm
+            target_triple: bun-linux-arm64-musl
           - package_name: hunkdiff-linux-x64
             runner: ubuntu-latest
+            target_triple: bun-linux-x64-musl
           - package_name: hunkdiff-windows-x64
             runner: windows-latest
           - package_name: hunkdiff-darwin-x64
@@ -55,6 +57,8 @@ jobs:
         run: bun install --frozen-lockfile
 
       - name: Build host artifact
+        env:
+          HUNK_TARGET_TRIPLE: ${{ matrix.target_triple }}
         run: |
           bun run build:bin
           bun run ./scripts/build-prebuilt-artifact.ts --expect-package "${{ matrix.package_name }}"

scripts/build-bin.ts

@@ -12,8 +12,15 @@ const legacyOutfile = path.join(distDir, process.platform === "win32" ? "otdiff.
 mkdirSync(distDir, { recursive: true });
 rmSync(legacyOutfile, { force: true });
 
+const buildArgs = ["bun", "build", "--compile"];
+const targetTriple = process.env.HUNK_TARGET_TRIPLE;
+if (targetTriple) {
+  buildArgs.push("--target", targetTriple);
+}
+buildArgs.push(path.join(repoRoot, "src", "main.tsx"), "--outfile", outfile);
+
 const proc = Bun.spawnSync(
-  ["bun", "build", "--compile", path.join(repoRoot, "src", "main.tsx"), "--outfile", outfile],
+  buildArgs,
   {
     cwd: repoRoot,
     stdin: "inherit",