It looks like one of the projects pulled in by the linter also uses the
"tools" build tag. When we turn on that build tag, we get build errors
in github.com/ryancurrah/gomodguard. So we just remove the build tag
during compilation as it's not actually needed (the build tag is just
there to not pull in the dependencies during the normal build).
- `make mock`: generates all the mocks for testing.
- `mock-check`: generates all the mocks + checks if any *.go file changed.
- `make gen`: generates all the auto generated files (protos + mocks).
- Add `mock-check` to our CI
The Makefile contained a number of copy/paste errors that we fix with
this commit: The make_ldflags function and RELEASE_TAGS variable were
missing and therefore resulted in empty strings.
With those things removed, we can then go ahead and build the correct
LDFLAGS variable and actually use it when building or installing the
binaries.
