USHIFT-3839: Add documentation for rpm-ostree to image mode upgrade details

[ggiguash]

We expect RHEL documentation to cover this process in great detail.
The current PR attempts to provide a minimal MicroShift-specific context. The mentioned workaround is currently tested / used in MicroShift CI.

[openshift-ci-robot]

@ggiguash: This pull request references USHIFT-3839 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 "4.19.0" version, but no target version was set.

In response to this:

We expect RHEL documentation to cover this process in great detail.
The current PR attempts to provide a minimal MicroShift-specific context. The mentioned workaround is currently tested / used in MicroShift CI.

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

[ggiguash]

PIP errors. Retrying verify test.
/test verify

[openshift-ci-robot]

@ggiguash: This pull request references USHIFT-3839 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 "4.19.0" version, but no target version was set.

In response to this:

We expect RHEL documentation to cover this process in great detail.
The current PR attempts to provide a minimal MicroShift-specific context. The mentioned workaround is currently tested / used in MicroShift CI.

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.

[pmtk]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

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

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• OWNERS [ggiguash,pmtk]

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[openshift-ci]

@ggiguash: all tests passed!

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