Speed up atlantis image build time by using actions/cache

[nitrocode]

Community Note

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Overview of the Issue

Builds can take up to 30 minutes within the container

Goreleaser only takes about 8 to 10 minutes

There are ways to reduce the time by taking advantage of actions/cache

https://markphelps.me/posts/speed-up-your-go-builds-with-actions-cache/

Reproduction Steps

See any build after a PR is merged or see atlantis-image PR checks

Logs

https://github.com/runatlantis/atlantis/actions/runs/3511730996/jobs/5882765189

Environment details

N/A

Additional Context

N/A

[nitrocode]

Closed by #2737 and #2738 by @Tenzer ! Thank you again.

Although builds are still slow, we are now taking advantage of caching. We may need to create a new ticket to speed up builds.