Make it simpler to compile a release build on Linux

release.sh

@@ -40,7 +40,9 @@ if [ "$WEBKIT_RELEASE_TYPE" == "relwithdebuginfo" ]; then
     CONTAINER_NAME=bun-webkit-linux-$BUILDKIT_ARCH-dbg
 fi
 
-if [ "$WEBKIT_RELEASE_TYPE" == "Debug" ]; then
+# If LTO is not enabled, we still need to be able to do a local release build.
+# We use bullseye for CI to support older versions of glibc, but that requires libc++.
+if [ "$WEBKIT_RELEASE_TYPE" == "Debug" || "$LTO_FLAG" == "" ]; then
     export DEBIAN_VERSION="bookworm"
 else
     export DEBIAN_VERSION="bullseye"