The code for a Ruby Step on Bitrise allowing to import profiles from a zip archive from the Generic File Storage (must be the env var `ADDITIONAL_PROVISIONING_PROFILES_ARCHIVE_URL`), if hitting the 30 prov profiles limit.

bitrise_import_additional_prov_profiles.rb

require 'fileutils'
require 'tmpdir'
require 'English'

prov_profiles_install_path = '~/Library/MobileDevice/Provisioning Profiles'

prov_profiles_archive_url = ENV['ADDITIONAL_PROVISIONING_PROFILES_ARCHIVE_URL']

temporary_dir = File.join(Dir.tmpdir, "additional_prov_profiles")

FileUtils.mkdir_p(temporary_dir)

begin
    archive_path = File.join(temporary_dir, 'prov_profiles.zip')
    archive_data = `curl -s -L #{prov_profiles_archive_url}`
    raise "Failed to download archive at #{prov_profiles_archive_url}; aborting" unless $CHILD_STATUS.success?

    File.write(archive_path, archive_data)

    prov_profiles_dir = File.join(temporary_dir, 'prov_profiles')

    raise "Couldn't unzip #{prov_profiles_archive_url}; aborting" unless system('unzip', '-q', archive_path, '-d', prov_profiles_dir)

    FileUtils.mkdir_p(prov_profiles_install_path)

    plist_dir = File.join(temporary_dir, 'prov_profile_plists')
    FileUtils.mkdir_p(plist_dir)

    Dir.glob(File.join(prov_profiles_dir, '**/*.mobileprovision')) do |prov_profile|
        basename = File.basename(prov_profile)
        name = File.basename(prov_profile, '.mobileprovision')
        puts "Installing #{name}..."

        plist_info_base_path = File.join(plist_dir, basename)
        plist_info_path = "#{plist_info_base_path}.plist"
        File.write(plist_info_path, `security cms -D -i '#{prov_profile}'`)
        raise "Couldn't parse provisioning profile; aborting" unless $CHILD_STATUS.success?

        uuid = `defaults read '#{File.expand_path(plist_info_base_path)}' UUID`
        raise "Couldn't read UUID from prov profile; aborting" unless $CHILD_STATUS.success?

        FileUtils.mv(prov_profile, File.join(prov_profiles_install_path, "#{uuid}.mobileprovision"))
        puts "Successfully installed #{name}."
    end
ensure
    FileUtils.rm_rf(temporary_dir)
end

puts 'Successfully installed provisioning profiles.'