[CI] Use content of TAG file for tag value
Summary
Uses the content of the TAG file for the tag value. Fixes the image tag used in the certification job.
- Incorrect: registry.gitlab.com/gitlab-org/cloud-native/charts/gitlab-ingress-nginx/controller:main-ubi8
- Correct: registry.gitlab.com/gitlab-org/cloud-native/charts/gitlab-ingress-nginx/controller:v1.2.1-ubi8
Testing
Edited by Mitchell Nielsen