Matt Moyer 8a41419b94 Optimize image build using .dockerignore and BuildKit features. ...

This optimizes our image in a few different ways:

- It adds a bunch of files and directories to the `.dockerignore` file.
  This lets us have a single `COPY . .` but still be very aggressive about pruning what files end up in the build context.

- It adds build-time cache mounts to the `go build` commands using BuildKit's `--mount=type=cache` flag.
  This requires BuildKit-capable Docker, but means that our Go builds can all be incremental builds.
  This replaces the previous flow we had where we needed to split out `go mod download`.

- Instead of letting the full `apt-get install ca-certificates` layer end up in our final image, we copy just the single file we need.

Signed-off-by: Matt Moyer <moyerm@vmware.com>

2021-01-27 10:42:56 -06:00

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