feat: user-identity-mapper job

[xcoulon]

code coming from https://github.com/codeready-toolchain/sandbox-sre/blob/master/cmd/user-identity-mapper/

Signed-off-by: Xavier Coulon [email protected]

[codecov]

Codecov Report

Merging #24 (d5a874d) into master (a7e9be9) will decrease coverage by 0.18%.
The diff coverage is 58.92%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #24      +/-   ##
==========================================
- Coverage   65.45%   65.27%   -0.18%     
==========================================
  Files          38       40       +2     
  Lines        1986     2042      +56     
==========================================
+ Hits         1300     1333      +33     
- Misses        528      551      +23     
  Partials      158      158              

Files	Coverage Δ
cmd/user-identity-mapper/user_identity_mapper.go	100.00% <100.00%> (ø)
cmd/user-identity-mapper/main.go	0.00% <0.00%> (ø)