Fix cross-compilation target by passing os/arch via --target flag instead of env vars

scripts/build.ts

@@ -44,7 +44,7 @@ async function buildTarget(target: BuildTarget) {
     ENTRY_POINT,
     '--compile',
     '--target',
-    'bun',
+    `bun-${target.os}-${target.arch}`,
     '--minify',
     '--sourcemap=external',
     '--outfile',
@@ -52,11 +52,6 @@ async function buildTarget(target: BuildTarget) {
   ], {
     stdout: 'inherit',
     stderr: 'inherit',
-    env: {
-      ...process.env,
-      BUN_TARGET_OS: target.os,
-      BUN_TARGET_ARCH: target.arch,
-    },
   })
 
   const exitCode = await proc.exited