Add make targets for local builds

[RedbackThomson]

Description of changes:
Adds a go.local.mod, and make targets using the new file, to more easily reference the local runtime package. Developers are now able to run make local-build-ack-generate to build and test changes to code-generator when updating runtime.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[vijtrip2]

Good improvement.

Any means of keeping the dependencies in go.local.mod and go.local.sum consistent with dependency updates in go.mod and go.sum.

Currently for code-generation, I just need to add a "replace" line in go.mod and just use existing make targets. With the new approach do you think there can be hidden surprises if go.local.mod and go.local.sum are not kept consistent.

[RedbackThomson]

With the new approach due you think there can be hidden surprises if go.local.mod and go.local.sum are not kept consistent

Hmm yeah if any of the other direct dependencies are not updated in the go.local.mod file, then it won't know to update those to be inline with go.mod. Not really sure how to reference the modules from go.mod, though. It's hard to google this stuff. So for now you would need to update dependencies in both places :/

[vijtrip2]

/approve

[brycahta]

nit: using the file name is clearer, Build ack-generate binary using go.local.mod

[brycahta]

I agree that keeping these 2 go.mod in sync will be a pain. One idea is could the make target be a bash script that edits go.mod file directly to make it "localized"? And running make build-controller would undo the edits

[RedbackThomson]

One idea is could the make target be a bash script that edits go.mod file directly to make it "localized"

No doubt someone will commit this change and include it in a PR. I don't think our go.mod changes too much that this will legitimately be too annoying. I just checked the file history and we essentially haven't changed anything apart from the runtime version since v0.4.0 or even before then.

[vijtrip2]

/lgtm

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