Add TLS and mTLS

[jasonodonnell]

Currently the action does not support TLS or mTLS. This adds new parameters to support these features:

Parameter	Default	Description
caCertificate	null	Base64 encoded CA certificate the server certificate was signed with.
clientCertificate	null	Base64 encoded client certificate the action uses to authenticate with Vault when mTLS is enabled.
clientKey	null	Base64 encoded client key the action uses to authenticate with Vault when mTLS is enabled.
tlsSkipVerify	false	When set to true, disables verification of server certificates when testing the action.

This current implementation expects that the client key is not password protected. This could be added in the future if needed.

I made some other tweaks while I was in here:

• Expanded and organized docker-compose.yaml for the various tests
• Updated test formatting
• Added TLS testing infrastructure. The cert/keys added to this repo are valid for 100 years.
• Set secrets on the repo that contain the certificate/key tests will use.
• Updated got to 11.5.1. This is required for the custom TLS settings.

All of these tests are run when a pull request is opened. See the checks below for the specific test outputs.

[tomhjp]

Nice 👍 LGTM, although my JavaScript knowledge is pretty shallow.

[Valarissa]

I enjoy how deliciously go-like this JS is, lol. LGTM.

[RichiCoder1]

Whoop! Nice.

I enjoy how deliciously go-like this JS is, lol. LGTM.

True to this action's history of being a mish-mash of language and pattern influences 😁