Pact Foundation

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Using `master` branch at <https://github.com/pact-foundation/pact-ruby-standalone/commit/b8c1020f2d8a7d8a624cb23b6fb5da1639932e3f|b8c1020> from <https://github.com/pact-foundation/pact-ruby-standalone/|pact-foundation/pact-ruby-standalone/> to install the CLI is not working any more for us, with error:
```warning: It seems your ruby installation is missing psych (for YAML output).
To eliminate this warning, please install libyaml and reinstall your ruby.```
With broker version
```# PACT_BROKER_CLI: ./pact/bin/pact-broker
$ echo "pact-broker version=$(${PACT_BROKER_CLI} version)"
pact-broker version=1.66.1```
Looks like <https://github.com/pact-foundation/pact-ruby-standalone/pull/100> contains the changes that trigger our error