collect_profiles.sh

function capture_profile {
  git checkout --quiet --force $commit_sha
  echo 'gem "rspec_profiling", group: [:development, :test]' >> Gemfile
  bundle install --quiet
  echo 'require "rspec_profiling/rspec"' >> spec/rails_helper.rb
  rake db:test:prepare
  rspec spec
}

function every_nth_commit {
  git rev-list --no-merges master |
  awk -v n="$1" 'NR == 1 || NR % n == 0'
}

every_nth_commit 10 | # Change 10 to whatever you're into
head -n 1 |
while read commit_sha;
  do capture_profile
done```