Fix code-server.sh script on macOS

Author: nhooyr

ci/code-server.sh

@@ -1,6 +1,14 @@
 #!/usr/bin/env sh
-# code-server.sh -- Run code-server with the bundled Node binary.
+# Runs code-server with the bundled Node binary.
 
-dir="$(dirname "$(readlink -f "$0" || realpath "$0")")"
+# More complicated than readlink -f or realpath to support macOS.
+# See https://github.com/cdr/code-server/issues/1537
+get_installation_dir() {
+  rel="$(readlink "$0")"
+  cd "$(dirname "$0")"
+  cd "$(dirname "$rel")"
+  pwd -P
+}
 
+dir=$(get_installation_dir)
 exec "$dir/node" "$dir/out/node/entry.js" "$@"