Adds graphql-gem-key

Merge pull request #2 from tedconf/PLAT-2426-add-testing-credentials-key

PLAT-2426 Add Encrypted Credentials Support

Merge pull request #1 from tedconf/PLAT-2426-sidekiq-pro-creds

PLAT-2426 Add Sidekiq Pro Creds Support

 Set ruby/setup-ruby to v1 to automatically get latest official releases

    (in this case, to be able to install ruby 2.7.* on ubuntu-22.04)

Bumps install dependency action for gems

Adds libgmp3-dev

Bumps ssh-agent to 0.7.0

Updates variable syntax

Updates variable syntax

Creates ruby-version input param