configs/baseline/profiledef.sh: compress more

* Use LZMA extreme compression level,
* enable experimental compressed fragments feature to create a smaller image,
* enable experimental data deduplication.

This decreases the baseline profile's `airootfs.erofs` size by about ~16 MiB.

CHANGELOG.rst

@@ -11,6 +11,9 @@ Added
 Changed
 -------
 
+- Increase EROFS compression for the baseline profile by using an extreme LZMA compression level and enabling the
+  experimental compressed fragments and data deduplication features.
+
 Deprecated
 ----------
 

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=('-zlzma,9' -E ztailpacking)
+airootfs_image_tool_options=('-zlzma,109' -E 'ztailpacking,fragments,dedupe')
 file_permissions=(
   ["/etc/shadow"]="0:0:400"
 )