Enable selinux for liveos iso flow

[gmileka]

Merge Checklist

All boxes should be checked before merging the PR (just tick any boxes which don't apply to this PR)

• The toolchain has been rebuilt successfully (or no changes were made to it)
• The toolchain/worker package manifests are up-to-date
• Any updated packages successfully build (or no packages were changed)
• Packages depending on static components modified in this PR (Golang, *-static subpackages, etc.) have had their Release tag incremented.
• Package tests (%check section) have been verified with RUN_CHECK=y for existing SPEC files, or added to new SPEC files
• All package sources are available
• cgmanifest files are up-to-date and sorted (./cgmanifest.json, ./toolkit/scripts/toolchain/cgmanifest.json, .github/workflows/cgmanifest.json)
• LICENSE-MAP files are up-to-date (./LICENSES-AND-NOTICES/SPECS/data/licenses.json, ./LICENSES-AND-NOTICES/SPECS/LICENSES-MAP.md, ./LICENSES-AND-NOTICES/SPECS/LICENSE-EXCEPTIONS.PHOTON)
• All source files have up-to-date hashes in the *.signatures.json files
• sudo make go-tidy-all and sudo make go-test-coverage pass
• Documentation has been updated to match any changes to the build system
• Ready to merge

---

Summary

To enable SELinux for the LiveOS ISO flow we need to:

• update the selinux policies.
  • this is done through the patch to the selinux-policy package.
• label the new overlay folders with root_t so that they match the expect context of the root /.
  • this is done by adding a new pre-pivot script to the dracut's overlayfs module which will mark the new folders correctly when SELinux is enabled.

Change Log

• Enable selinux for liveos iso flow

Does this affect the toolchain?

• NO

Associated issues

• #xxxx

Links to CVEs

• n/a

Test Methodology

• Build baremetal images with SELinux enabled in enforcing mode.
• Use MIC to create a LiveOS ISO, boot it, and log-in.

[pebenito]

A couple minor comments, otherwise looks good to me.