Update mimemagic gem; remove unneeded files to save space

Makefile

@@ -31,6 +31,7 @@ all: database-config
 	mkdir gitlab-home
 
 	tar xf gitlab-foss-v13.1.0.tar.bz2 -C /srv/www --strip-components=1
+	patch -Np1 -d /srv/www < gitlab-foss-v13.1.0-gems_update.patch
 	rm -rf /srv/www/index.html
 
 	cd /srv/www && mv config/gitlab.yml.example config/gitlab.yml
@@ -55,6 +56,11 @@ all: database-config
 	cd /srv/www && HOME=$(CURDIR)/gitlab-home bundle exec rake gitlab:assets:compile RAILS_ENV=production NODE_ENV=production NODE_OPTIONS="--max-old-space-size=3072"
 
 	rm -rf /usr/local/share/.yarnrc
+	rm -rf /srv/www/tmp/cache/*
+	rm -rf /srv/www/vendor/bundle/ruby/*/gems/nokogumbo-*/ext/nokogumboc/tmp
+	rm -rf /srv/www/vendor/bundle/ruby/*/gems/graphiql-rails-*/test/dummy/tmp
+	find /srv/www -name *.gz -exec rm -f '{}' ';'
+	find / -name *.gem -exec rm -f '{}' ';'
 	find / -name *.pyc -exec rm -f '{}' ';'
 	find / -name *.js.map -exec rm -f '{}' ';'
 	find / -name *.css.map -exec rm -f '{}' ';'

gitlab-foss-v13.1.0-gems_update.patch

+diff -uNr gitlab-foss-v13.1.0/Gemfile.lock gitlab-foss-v13.1.0-gems_update/Gemfile.lock
+--- gitlab-foss-v13.1.0/Gemfile.lock	2020-06-20 02:15:52.000000000 +0930
++++ gitlab-foss-v13.1.0-gems_update/Gemfile.lock	2021-03-26 23:01:59.989671194 +1030
+@@ -630,7 +630,9 @@
+     mime-types (3.2.2)
+       mime-types-data (~> 3.2015)
+     mime-types-data (3.2019.0331)
+-    mimemagic (0.3.5)
++    mimemagic (0.3.9)
++      nokogiri (~> 1)
++      rake
+     mini_histogram (0.1.3)
+     mini_magick (4.9.5)
+     mini_mime (1.0.2)