JKNS-458: Add Konflux-compatible Dockerfile

[adambkaplan]

Adding a Dockerfile for testing the Jenkins client plugin that does not rely on the OpenShift CI registry for base images. This will pay dividends when we eventually build the Jenkins images and plugins on Konflux, as this Dockerfile only uses productized images published on registry.redhat.io.

This also adds a .dockerignore to ensure generated or test content is not present when developers build this image themselves locally.

[openshift-ci-robot]

@adambkaplan: This pull request references JKNS-457 which is a valid jira issue.

Warning: The referenced jira issue has an invalid target version for the target branch this PR targets: expected the bug to target the "4.17.0" version, but no target version was set.

In response to this:

Adding a Dockerfile for testing the Jenkins client plugin that does not rely on the OpenShift CI registry for base images. This will pay dividends when we eventually build the Jenkins images and plugins on Konflux, as this Dockerfile only uses productized images published on registry.redhat.io.

This also adds a .dockerignore to ensure generated or test content is not present when developers build this image themselves locally.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the openshift-eng/jira-lifecycle-plugin repository.

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: adambkaplan
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[openshift-ci-robot]

@adambkaplan: This pull request references JKNS-458 which is a valid jira issue.

Warning: The referenced jira issue has an invalid target version for the target branch this PR targets: expected the story to target the "4.17.0" version, but no target version was set.

In response to this:

Adding a Dockerfile for testing the Jenkins client plugin that does not rely on the OpenShift CI registry for base images. This will pay dividends when we eventually build the Jenkins images and plugins on Konflux, as this Dockerfile only uses productized images published on registry.redhat.io.

This also adds a .dockerignore to ensure generated or test content is not present when developers build this image themselves locally.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the openshift-eng/jira-lifecycle-plugin repository.

[openshift-ci]

@adambkaplan: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/e2e-aws-jenkins-client-plugin	2cea2ad	link	true	/test e2e-aws-jenkins-client-plugin
ci/prow/security	2cea2ad	link	false	/test security

Full PR test history. Your PR dashboard.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository. I understand the commands that are listed here.