Push `REPO_VERSION` var into containers for builds #737

Job	Run time
Dependency Updates / Assert PR branch is ahead	4s
Go Module Validation / Assert PR branch is ahead	3s
Lint / Assert PR branch is ahead	4s
Vulnerability / Assert PR branch is ahead	6s
Go Module Validation / Look for missing go.mod changes	18s
Go Module Validation / Look for missing vendored dependencies	21s
Dependency Updates / Look for available minor or patch releases	24s
Lint / Lint Markdown files	10s
Lint / Lint Dockerfiles	7s
Vulnerability / govulncheck	21s
	1m 58s

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