Use go-toolset golang base image for redhat builds

[simonbaird]

Use root user instead of the 'default' user from go-toolset to avoid an error like this:

fatal: detected dubious ownership in repository at '/build'
To add an exception for this directory, call:
git config --global --add safe.directory /build

Could also have solved the problem by doing a --chown=default:root when copying in the files.

Ref: https://issues.redhat.com/browse/EC-625

[robnester-rh]

Does this leave the working user as root and does that present any security concerns?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.39%. Comparing base (3ce6dd4) to head (5a8f39e).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1608      +/-   ##
==========================================
+ Coverage   80.70%   87.39%   +6.69%     
==========================================
  Files          65       76      +11     
  Lines        4794     5134     +340     
==========================================
+ Hits         3869     4487     +618     
+ Misses        925      647     -278     

Flag	Coverage Δ
acceptance	73.07% <ø> (?)
generative	80.70% <ø> (ø)
integration	80.70% <ø> (ø)
unit	80.70% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

see 43 files with indirect coverage changes

[simonbaird]

Does this leave the working user as root and does that present any security concerns?

No, because it's just the build step. In the final image we have USER 1001.

[robnester-rh]

LGTM

[robnester-rh]

Does this leave the working user as root and does that present any security concerns?

No, because it's just the build step. In the final image we have USER 1001.

Ack.