make aur build check if u are glibc system or a musl system (#4519)

packages/opencode/script/publish.ts

@@ -131,7 +131,34 @@ if (!Script.preview) {
     "",
     "package() {",
     `  cd "opencode-\${pkgver}/packages/opencode"`,
-    '  install -Dm755 $(find dist/*/bin/opencode) "${pkgdir}/usr/bin/opencode"',
+    '  mkdir -p "${pkgdir}/usr/bin"',
+    '  arch="x64"',
+    '  case "$CARCH" in',
+    '    x86_64) arch="x64" ;;',
+    '    aarch64) arch="arm64" ;;',
+    '    *) printf "unsupported architecture: %s\\n" "$CARCH" >&2 ; return 1 ;;',
+    "  esac",
+    '  libc=""',
+    "  if command -v ldd >/dev/null 2>&1; then",
+    "    if ldd --version 2>&1 | grep -qi musl; then",
+    '      libc="-musl"',
+    "    fi",
+    "  fi",
+    '  if [ -z "$libc" ] && ls /lib/ld-musl-* >/dev/null 2>&1; then',
+    '    libc="-musl"',
+    "  fi",
+    '  base=""',
+    '  if [ "$arch" = "x64" ]; then',
+    "    if ! grep -qi avx2 /proc/cpuinfo 2>/dev/null; then",
+    '      base="-baseline"',
+    "    fi",
+    "  fi",
+    '  bin="dist/opencode-linux-${arch}${base}${libc}/bin/opencode"',
+    '  if [ ! -f "$bin" ]; then',
+    '    printf "unable to find binary for %s%s%s\\n" "$arch" "$base" "$libc" >&2',
+    "    return 1",
+    "  fi",
+    '  install -Dm755 "$bin" "${pkgdir}/usr/bin/opencode"',
     "}",
     "",
   ].join("\n")