Use --relocate-xdg-cache-home-under-build-subdir for Linux PR presets

Author: edymtt

utils/build-presets.ini

@@ -806,6 +806,13 @@ install-destdir=%(install_destdir)s
 # Path to the .tar.gz package we would create.
 installable-package=%(installable_package)s
 
+# This ensures the default module cache
+# location is local to this run, allowing
+# to schedule multiple builds safely
+# in Linux CI bots
+relocate-xdg-cache-home-under-build-subdir
+
+
 [preset: buildbot_linux]
 mixin-preset=mixin_linux_installation
 build-subdir=buildbot_linux