Improve apprepository-controller build time

[SimonAlling]

See #1342.

I haven't worked with apprepository-controller, but this PR is helpful for make all at least.

[absoludity]

LGTM. Thanks for making the build times faster.

Out of interest, when are you using make all? I generally just build the image for the service that I'm working on, but interested to know what your workflow is.

[SimonAlling]

Out of interest, when are you using make all? I generally just build the image for the service that I'm working on, but interested to know what your workflow is.

"Workflow" might be a bit of a stretch, but I tend to make all sometimes when I want to be sure that everything is rebuilt. I usually do make all && make test before pushing at least.