Symlink duplicate gems to save space

Makefile

@@ -113,6 +113,17 @@ all: database-config resque-yml nginx-conf
 	rm -rf /usr/local/share/.yarnrc
 	/bin/sh cleanup gitlab dev doc git tests cache ports man patches node_modules windows macos bytecode maps packed_assets
 
+	root=/srv ; \
+	folders=(`find $$root -name gems -type d`) ; \
+	dupes=`find $$root -name gems -type d -exec ls -1 '{}' ';' | sort | uniq -d` ; \
+	origin=$${folders[0]} ; \
+	for gem in $$dupes; do \
+	    for folder in $${folders[@]:1}; do \
+		rm -rf $$folder/$$gem  ; \
+		ln -sv $$origin/$$gem $$folder/$$gem ; \
+	    done ; \
+	done
+
 	rm -rf gitlab-home
 	umount /tmp
 	rm -rf tmp