Add erofs compressed rootfs support

[bcl]

This adds support for creating the rootfs using the erofs compression format. https://erofs.docs.kernel.org/en/latest/quickstart.html

You can run it by checking out this branch from github (into /root/lorax in this example) and running:

#!/bin/bash

# Gather up the list of system repo files and use them for lorax
REPOS=$(for f in /etc/yum.repos.d/*repo; do echo -n "--repo $f "; done)
if [ -z "$REPOS" ]; then
    echo "No system repos found"
    exit 1
fi

PATH=/root/lorax/src/bin:/root/lorax/src/sbin:$PATH PYTHONPATH=/root/lorax/src/ \
/root/lorax/src/sbin/lorax --product="Fedora" --version=41  --release=41 \
--volid="Fedora-rawhide-test" \
--rootfs-type erofs \
--proxy http://proxy.notae.us:8123 \
$REPOS /var/tmp/lorax-fedora-iso/ || exit 1

There will be a boot.iso and an install.img in /var/tmp/lorax-fedora-iso/images/

The resulting boot.iso will boot and mount the erofs filesystem, but the overlay doesn't appear to work so it is read only. Dracut still needs some work to fully support this, but this should be a good starting point.

[coveralls]

Pull Request Test Coverage Report for Build 9718884846

Details

• 24 of 74 (32.43%) changed or added relevant lines in 5 files are covered.
• 5 unchanged lines in 3 files lost coverage.
• Overall coverage decreased (-0.2%) to 43.483%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/pylorax/cmdline.py	0	6	0.0%
src/pylorax/creator.py	12	20	60.0%
src/pylorax/treebuilder.py	5	17	29.41%
src/pylorax/init.py	3	27	11.11%

Files with Coverage Reduction	New Missed Lines	%
src/pylorax/creator.py	1	39.0%
src/pylorax/cmdline.py	2	0.0%
src/pylorax/init.py	2	17.26%

Totals
Change from base Build 9665356445:	-0.2%
Covered Lines:	1640
Relevant Lines:	3568

---

💛 - Coveralls

[bcl]

This requires this dracut PR - dracut-ng/dracut-ng#490

[coveralls]

Pull Request Test Coverage Report for Build 9942739515

Details

• 18 of 64 (28.13%) changed or added relevant lines in 5 files are covered.
• 3 unchanged lines in 2 files lost coverage.
• Overall coverage decreased (-0.2%) to 43.457%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/pylorax/cmdline.py	0	5	0.0%
src/pylorax/creator.py	6	11	54.55%
src/pylorax/treebuilder.py	5	17	29.41%
src/pylorax/init.py	3	27	11.11%

Files with Coverage Reduction	New Missed Lines	%
src/pylorax/cmdline.py	1	0.0%
src/pylorax/init.py	2	17.26%

Totals
Change from base Build 9665356445:	-0.2%
Covered Lines:	1634
Relevant Lines:	3559

---

💛 - Coveralls

[bcl]

Merged to master.