updates image tag variable to leverage app interface

[tonytheleg]

PR Template:

Describe your changes

• App interface, when using openshift templates, makes the IMAGE_TAG variable available in all deployments for setting the image tag. This value is generated from the short hash of the git commit which matches our image tags in Quay. This will ensure the desired commit is always running versus using latest which has security issues and may also not be latest with regards to code changes

See DOCS

Ticket reference (if applicable)

Fixes #

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[Rajagopalan-Ranganathan]

/lgtm