chore: cleanup

[wass3r]

• use Go's new embedded vcs info for git hash
• use digests for images
• update docs for accuracy
• updates golangci-lint to latest
• turn dockerignore into stricter allow vs exclude list

[coveralls]

Pull Request Test Coverage Report for Build 2177904191

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 0.0%

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Totals
Change from base Build 2177903770:	0.0%
Covered Lines:	0
Relevant Lines:	0

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💛 - Coveralls

[wass3r]

this will actually not work as-is. we need the .git directory and git binary in the build context for the build stage in docker for Go to be able to pick up the revision info 🤔