configs/baseline/profiledef.sh: use LZMA compression for the EROFS image

Now that xz 5.4 is out and erofs-utils is built with LZMA support, it is
possible to compress the EROFS image with LZMA for higher compression.
`mkfs.erofs` trows a few warnings about using experimental features, but
they should not be an issue.

Nothing changes for the releng profile, for now at least.

CHANGELOG.rst

@@ -16,6 +16,8 @@ Changed
 - Open the file descriptors for code signing certificates and GPG public key as read only. Nothing from the within the
   ``pacstrap`` invoked chroot should ever be allowed to write outside of it.
 - Error out early if any of the code signing certificate files passed with option ``-c`` do not exist.
+- Use LZMA compressed EROFS image for the baseline profile. Now that xz 5.4 is out and erofs-utils is built with LZMA
+  support, using a higher compression is possible.
 
 Removed
 -------

configs/baseline/profiledef.sh

@@ -14,7 +14,7 @@ bootmodes=('bios.syslinux.mbr' 'bios.syslinux.eltorito'
 arch="x86_64"
 pacman_conf="pacman.conf"
 airootfs_image_type="erofs"
-airootfs_image_tool_options=('-zlz4hc,12' -E ztailpacking)
+airootfs_image_tool_options=('-zlzma,9' -E ztailpacking)
 file_permissions=(
   ["/etc/shadow"]="0:0:400"
 )