Fix for issue #515, This PR ensures only those signers which are specified as signers for any artifact are initialized.

[jagathprakash]

Changes

Fixes #515
This PR ensures only those signers which are specified as signers for any artifact are initialized.
This change ensures that we do not initialize unwanted signers for which we might not have all necessary configs, which was resulting in unwanted errors in logs.

Submitter Checklist

As the author of this PR, please check off the items in this checklist:

• Has Docs included if any changes are user facing
• Has Tests included if any functionality added or changed
• Follows the commit message standard
• Meets the Tekton contributor standards (including
  functionality, content, code)
• Release notes block below has been updated with any user facing changes (API changes, bug fixes, changes requiring upgrade notices or deprecation warnings)
• Release notes contains the string "action required" if the change requires additional action from users switching to the new release

Release Notes

NONE

[tekton-robot]

The following is the coverage report on the affected files.
Say /test pull-tekton-chains-go-coverage to re-run this coverage report

File	Old Coverage	New Coverage	Delta
pkg/chains/signing.go	78.9%	75.5%	-3.4

[wlynch]

LGTM!

Main piece of feedback is let's update the commit message / PR body to add more details on what the change does - https://github.com/tektoncd/community/blob/main/standards.md#commits

My rule of thumb is you should be able to have a rough idea of what the change is doing even if you only have access to git log / git blame.

[tekton-robot]

The following is the coverage report on the affected files.
Say /test pull-tekton-chains-go-coverage to re-run this coverage report

File	Old Coverage	New Coverage	Delta
pkg/chains/signing.go	78.9%	75.5%	-3.4

[tekton-robot]

The following is the coverage report on the affected files.
Say /test pull-tekton-chains-go-coverage to re-run this coverage report

File	Old Coverage	New Coverage	Delta
pkg/chains/signing.go	78.9%	75.5%	-3.4

[jagathprakash]

LGTM!

Main piece of feedback is let's update the commit message / PR body to add more details on what the change does - https://github.com/tektoncd/community/blob/main/standards.md#commits

My rule of thumb is you should be able to have a rough idea of what the change is doing even if you only have access to git log / git blame.

@wlynch thanks for the review! Agree to the requirement for detailed messaging. I have updated the PR message as well as the commit to be more detailed.

[tekton-robot]

The following is the coverage report on the affected files.
Say /test pull-tekton-chains-go-coverage to re-run this coverage report

File	Old Coverage	New Coverage	Delta
pkg/chains/signing.go	78.9%	75.5%	-3.4

[wlynch]

/lgtm

[tekton-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: wlynch

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