Adding ansible credentials and bugfix for 2.0

[henriquemoraes8]

• What I did

Adoption has been working on formulas for the API Manager team. One of them requires the provisioning of some hcl files to the cluster, which is done with Ansible. So it is being added to the pool of credentials

There was a bug in when adding a new credential provider, it would not be listed because the default credentials were only added if there was no config file. Upon further investigation, I think this file is not rewritten on updates as well. So the solution was to check a diff of the default credentials vs the current config.json file

• How to verify it
  Run rit set credential and check for the existence of ansible option

• Description for the changelog
  Added ansible support to rit set credential

[codecov-commenter]

Codecov Report

Merging #327 into ritchie-2.0.0 will increase coverage by 0.88%.
The diff coverage is 73.38%.

@@                Coverage Diff                @@
##           ritchie-2.0.0     #327      +/-   ##
=================================================
+ Coverage          65.21%   66.09%   +0.88%     
=================================================
  Files                 78       78              
  Lines               2550     2572      +22     
=================================================
+ Hits                1663     1700      +37     
+ Misses               725      703      -22     
- Partials             162      169       +7     

Impacted Files	Coverage Δ
pkg/cmd/build_formula.go	0.00% <0.00%> (ø)
pkg/cmd/root.go	0.00% <0.00%> (ø)
pkg/credential/finder.go	68.42% <ø> (ø)
pkg/formula/builder/bat.go	0.00% <0.00%> (ø)
pkg/formula/builder/local.go	72.54% <ø> (ø)
pkg/formula/formula.go	90.90% <ø> (ø)
pkg/formula/runner/post_run.go	50.00% <ø> (ø)
pkg/cmd/list_credential.go	80.00% <50.00%> (ø)
pkg/cmd/formulas.go	87.87% <57.14%> (-2.45%)	⬇️
pkg/credential/settings.go	82.64% <60.86%> (-3.77%)	⬇️
... and 18 more

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