(RHEL-94663) fix(systemd): systemd.volatile needs overlayfs kernel module

[pvalena]

See https://www.freedesktop.org/software/systemd/man/latest/systemd-volatile-root.service.html

This service is only enabled if full volatile mode is selected,
for example by specifying "systemd.volatile=yes" on the kernel command line.
This service runs only in the initrd, before the system transitions to the host's root directory.
Note that this service is not used if "systemd.volatile=state" is used, as in that mode the root
directory is non-volatile.

Support for this systemd feature has been added in systemd v242 .
systemd/systemd#11243

(cherry picked from commit 33f2e49d600294fb54620f029e10fd74de54bfa8)

Resolves: RHEL-94663

[github-actions]

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Tracker - RHEL-94663

The following commits need an inspection

commit	note
d4d9390 - fix(systemd): systemd.volatile needs overlayfs kernel module	Missing upstream reference ‼️

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🟢 Tracker RHEL-94663 has set desired product: rhel-9.7
🟢 Tracker RHEL-94663 has set desired component: dracut
🟢 Tracker RHEL-94663 has been approved
🟢 Tracker RHEL-94663 has set severity

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sh-checker report

To get the full details, please check in the job output.

shellcheck errors

'shellcheck ' returned error 1 finding the following syntactical issues:

----------

In .distro/backport_fix.sh line 1:
#!/usr/bin/zsh
^-- SC1071: ShellCheck only supports sh/bash/dash/ksh scripts. Sorry!

For more information:
  https://www.shellcheck.net/wiki/SC1071 -- ShellCheck only supports sh/bash/...
----------

You can address the above issues in one of three ways:
1. Manually correct the issue in the offending shell script;
2. Disable specific issues by adding the comment:
  # shellcheck disable=NNNN
above the line that contains the issue, where NNNN is the error code;
3. Add '-e NNNN' to the SHELLCHECK_OPTS setting in your .yml action file.

shfmt errors

'shfmt -s' found no issues.

[pvalena]

LGTM.