Make public_key.pkcs7.pem a RSA public key instead of a X509 certificate #120

Job	Run time
Ruby 2.7 - Puppet ~> 7.24	2m 8s
Ruby 3.0 - Puppet ~> 7.24	1m 54s
Ruby 3.1 - Puppet ~> 8.0	1m 53s
Ruby 3.1 - Puppet ~> 7.24	1m 54s
Ruby 3.1 - Puppet https://github.com/puppetlabs/puppet.git#main	2m 4s
Ruby 3.2 - Puppet ~> 8.0	1m 51s
Ruby 3.2 - Puppet ~> 7.24	1m 50s
Ruby 3.2 - Puppet https://github.com/puppetlabs/puppet.git#main	1m 57s
Test suite	1s
	15m 32s

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