Merge pull request #3020 from overleaf/jpa-harden-copying-of-makefiles

[misc] make: harden parallel copying of the Makefile.module

GitOrigin-RevId: 2612516ebf1e33022233ad19741e5c7cda014483

services/web/Makefile

@@ -17,7 +17,7 @@ MODULE_MAKEFILES := $(MODULE_DIRS:=/Makefile)
 MODULE_NAME=$(shell basename $(MODULE))
 
 $(MODULE_MAKEFILES): Makefile.module
-	cp Makefile.module $@
+	cp Makefile.module $@ || diff Makefile.module $@
 
 #
 # Clean