Adds the option to use SSL certificates when using WP-Cypress

Description

Partially fixes #88 - allows the user to add their own SSL certificates using the sslCertificate property in cypress.json. If the user does provide a certificate, WP-Cypress will use the port number provided by the sslPort property instead of the port property in cypress.json. If an sslPort is not provided, the port number will default to 4433 as explained in #88.

Change Log

• Adds support for sslCertificate and sslPort properties in cypress.json
• If sslCertificate is provided, WP-Cypress will use the sslPort port number defaulting to 4433.

Types of changes (if applicable):

• Bug fix (non-breaking change which fixes an issue).
• New feature (non-breaking change which adds functionality).
• Breaking change (fix or feature that would cause existing functionality to not work as expected).

Checklist (if applicable):

• Meets provided linting standards.

Stuff to add to the wiki

Configuration Schema

After 'url' and before 'ports' this should be add to the configuration schema:

sslCertificate

sslCertificate

• Type: object

cert

• Type: string
• Example: path/to/ssl-certificate

key

• Type: string
• Example: path/to/ssl-key

sslPort

• Type: number
• Example: 3773

Guide

Here are the steps to get https working with WP-Cypress:

1. Install mkcert by following the instructions at: https://github.com/FiloSottile/mkcert
2. Run mkcert localhost in the directory you want your certificate and key to be located (you must call the certificate localhost since it needs to be valid for that domain name)
3. Add the following to your cypress.json file:

    "sslCertificate": {
      "cert": "relative-path/to/certificate",
      "key": "relative-path/to/key"
    }

Note that the Cypress browser itself will not trust SSL certificates due to the proxy it uses. If you want to test that it works, copy the URL and use a different browser. The new browser should show that the connection is secure.