Share the Go build cache when building in Dockerfiles #1853
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Description
On my machine this makes image rebuilds go from ~5m to 1.5s.
This also required setting
DOCKER_BUILDKIT=1
in integration test image builds.I also took the opportunity to bump the Go version used in those tests to Go 1.17 to match the image build processes, and tidied up the workflow files a bit too (renaming for consistency, typos, whitespace, etc.)
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