Merge pull request #3447 from alphagov/update-banner-env-var #2544

Job	Run time
Test Ruby	36s
Dependency Review scan / dependency-review-push	6s
Lint JavaScript / Run Standardx	15s
Dependency Review scan / dependency-review-pr	0s
CodeQL SAST scan / Analyze	3m 45s
Lint Ruby / Run RuboCop	8s
Lint SCSS / Run Stylelint	14s
Test JavaScript / Run Jasmine	40s
Security Analysis / Run Brakeman	19s
	6m 3s

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