OCPBUGS-76450: re-add caching directives to Dockerfile

[cheesesashimi]

- What I did

Re-adds the caching directives to our Dockerfile to both speed up local builds and reduce overall image size.

- How to verify it

- Description for the changelog

[openshift-ci-robot]

@cheesesashimi: This pull request references Jira Issue OCPBUGS-76450, which is valid.

3 validation(s) were run on this bug

• bug is open, matching expected state (open)
• bug target version (4.22.0) matches configured target version for branch (4.22.0)
• bug is in the state POST, which is one of the valid states (NEW, ASSIGNED, POST)

Requesting review from QA contact:
/cc @sergiordlr

The bug has been updated to refer to the pull request using the external bug tracker.

Details

In response to this:

- What I did

Re-adds the caching directives to our Dockerfile to both speed up local builds and reduce overall image size.

- How to verify it

- Description for the changelog

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]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[cheesesashimi]

/test images

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: cheesesashimi

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• OWNERS [cheesesashimi]

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[openshift-ci]

@cheesesashimi: The following test 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/images	5d673d2	link	true	/test images

Full PR test history. Your PR dashboard.

Details

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[cheesesashimi]

It looks like we still can't do this, so I will close this PR in favor of #5644.

For posterity, this is the error message:

 error running container: from /usr/bin/runc creating container for [/bin/sh -c make install DESTDIR=./instroot-rhel9 && tar -C instroot-rhel9 -cf instroot-rhel9.tar .]: time="2026-02-10T15:27:58Z" level=error msg="runc create failed: invalid mount &{Source:/var/tmp/buildah412629249/mnt/buildah-bind-target-10 Destination:/go/rhel9/.cache Device:bind Flags:20480 ClearedFlags:1 PropagationFlags:[1048576] Data:z Relabel: RecAttr:<nil> Extensions:0 IDMapping:<nil>}: bind mounts cannot have any filesystem-specific options applied" 

[openshift-ci-robot]

@cheesesashimi: This pull request references Jira Issue OCPBUGS-76450. The bug has been updated to no longer refer to the pull request using the external bug tracker.

Details

In response to this:

- What I did

Re-adds the caching directives to our Dockerfile to both speed up local builds and reduce overall image size.

- How to verify it

- Description for the changelog

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.