USHIFT-5406: Optimize mirror images operation for repetitive runs

[ggiguash]

The mirror_registry.sh script is run automatically on every build_bootc_images.sh invocation and the process takes ~1m after all the images were mirrored. This is annoying in development environment.

With the optimizations in the PR commits, the repetitive run time was brought down to 10-15s. Interestingly, the majority of time was taken by suboptimal find+chmod operations.

[openshift-ci-robot]

@ggiguash: This pull request references USHIFT-5406 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 task to target the "4.19.0" version, but no target version was set.

In response to this:

The mirror_registry.sh script is run automatically on every build_bootc_images.sh invocation and the process takes ~1m after all the images were mirrored. This is annoying in development environment.

With the optimizations in the PR commits, the repetitive run time was brought down to 10-15s. Interestingly, the majority of time was taken by suboptimal find+chmod operations.

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[ggiguash]

/assign @pmtk

[ggiguash]

/test e2e-aws-tests-bootc-periodic-arm
/test e2e-aws-tests-bootc-periodic

[pmtk]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ggiguash, pmtk

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[openshift-ci-robot]

/retest-required

Remaining retests: 0 against base HEAD 3da083c and 2 for PR HEAD 22e1eaa in total

[openshift-ci-robot]

/retest-required

Remaining retests: 0 against base HEAD 3da083c and 2 for PR HEAD 22e1eaa in total

[openshift-ci-robot]

/retest-required

Remaining retests: 0 against base HEAD f1e409e and 2 for PR HEAD 22e1eaa in total

[openshift-ci-robot]

/retest-required

Remaining retests: 0 against base HEAD f1e409e and 2 for PR HEAD 22e1eaa in total

[openshift-ci-robot]

/retest-required

Remaining retests: 0 against base HEAD 47fd748 and 1 for PR HEAD 22e1eaa in total

[ggiguash]

The failures in bootc periodics are due to router security tests, unrelated to the current changes.
/override ci/prow/e2e-aws-tests-bootc-periodic ci/prow/e2e-aws-tests-bootc-periodic-arm

[openshift-ci]

@ggiguash: Overrode contexts on behalf of ggiguash: ci/prow/e2e-aws-tests-bootc-periodic, ci/prow/e2e-aws-tests-bootc-periodic-arm

In response to this:

The failures in bootc periodics are due to router security tests, unrelated to the current changes.
/override ci/prow/e2e-aws-tests-bootc-periodic ci/prow/e2e-aws-tests-bootc-periodic-arm

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[openshift-ci]

@ggiguash: all tests passed!

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