Merge branch 'sh-reduce-arm-build-size' into 'master'

Reduce Ubuntu 20 ARM package size

Closes #5661

See merge request gitlab-org/omnibus-gitlab!4637

changelogs/unreleased/sh-reduce-arm-build-size.yml

+---
+title: Reduce Ubuntu 20 ARM package size
+merge_request: 4637
+author:
+type: other

config/projects/gitlab.rb

@@ -208,8 +208,12 @@ exclude 'embedded/lib/ruby/gems/*/gems/*/sample'
 exclude 'embedded/lib/ruby/gems/*/gems/*/script'
 exclude 'embedded/lib/ruby/gems/*/gems/*/t'
-# Exclude additional test files from specific gems
+# Exclude additional files from specific gems
+exclude 'embedded/lib/ruby/gems/*/gems/grpc-*/include'
+exclude 'embedded/lib/ruby/gems/*/gems/grpc-*/src/core'
+exclude 'embedded/lib/ruby/gems/*/gems/grpc-*/src/ruby/ext'
 exclude 'embedded/lib/ruby/gems/*/gems/grpc-*/src/ruby/spec'
+exclude 'embedded/lib/ruby/gems/*/gems/grpc-*/third_party'
 # Enable signing packages
 package :rpm do