USAGOV-2116 PHPStan config

[omerida]

Jira Task

https://cm-jira.usa.gov/browse/USAGOV-2116

Description

Installs phpstan for local scanning.

Type of Changes

• New Feature
• Bugfix
• Frontend (Twig, Sass, JS)
  • Add screenshot showing what it should look like
• Drupal Config (requires "drush cim")
• New Modules (requires rebuild)
• Documentation
• Infrastructure
  • CMS
  • WAF
  • WWW
  • Egress
  • Tools
  • Cron
• Other

Testing Instructions

Change Requirements

• Requires New Documentation (Link: {})
• Requires New Config
• Requires New Content

Validation Steps

• Run bin/composer install
• Confirm shortcut bin/composer phpstan runs and shows errors.

Security Review

• Adds/updates software (including a library or Drupal module)
  • Only adds new composer libraries as a developer dependency.
• Communication with external service
• Changes permissions or workflow
• Requires SSPP updates

Reviewer Reminders

• Reviewed code changes
• Reviewed functionality
• Security review complete or not required

Post PR Approval Instructions

Follow these steps as soon as you merge the new changes.

1. Go to the USAGov Circle CI project.
2. Find the commit of this pull request.
3. Build and deploy the changes.
4. Update the Jira ticket by changing the ticket status to Review in Test and add a comment. State whether the change is already visible on cms-dev.usa.gov and beta-dev.usa.gov, or if the deployment is still in process.

[akf]

I do indeed see errors when I run this!
I'm just asking for a little tweak to the README.

[akf]

And now there's a merge conflict, alas.

[omerida]

@akf on it

[omerida]

@akf merge conflict fixed