NO-JIRA: add imagepullsecret support to chart

[pfeifferj]

this PR adds:

• a new imagePullSecrets array field to the plugin section in values.yaml (defaulting to empty array)
• a conditional section in the deployment.yaml template that includes the pull secrets configuration when provided

closes #86

[openshift-ci-robot]

@pfeifferj: This pull request explicitly references no jira issue.

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In response to this:

this PR adds:

• a new imagePullSecrets array field to the plugin section in values.yaml (defaulting to empty array)
• a conditional section in the deployment.yaml template that includes the pull secrets configuration when provided

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[openshift-ci]

@pfeifferj: all tests passed!

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[jhadvig]

/lgtm
/approve

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jhadvig, pfeifferj

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