configs/*/profiledef.sh: set bootstrap_tarball_compression

* bootstrap will use .tar.zst with `zstd -c -T0 --long -19`,
* releng will retain .tar.gz with `gzip -cn9` for now.

This will later be changed as part of https://gitlab.archlinux.org/archlinux/archiso/-/issues/130.

CHANGELOG.rst

@@ -10,7 +10,7 @@ Added
 
 - Add a man page for ``mkarchiso``.
 - Implement configurable bootstrap tarball compression. It is configured in ``profiledef.sh`` using a bash array called
-  ``bootstrap_tarball_compression``.
+  ``bootstrap_tarball_compression``. baseline tarball now uses zstd compression while releng remains with gzip for now.
 
 Changed
 -------

configs/baseline/profiledef.sh

@@ -15,6 +15,7 @@ arch="x86_64"
 pacman_conf="pacman.conf"
 airootfs_image_type="erofs"
 airootfs_image_tool_options=('-zlzma,109' -E 'ztailpacking,fragments,dedupe')
+bootstrap_tarball_compression=(zstd -c -T0 --long -19)
 file_permissions=(
   ["/etc/shadow"]="0:0:400"
 )

configs/releng/profiledef.sh

@@ -15,6 +15,7 @@ arch="x86_64"
 pacman_conf="pacman.conf"
 airootfs_image_type="squashfs"
 airootfs_image_tool_options=('-comp' 'xz' '-Xbcj' 'x86' '-b' '1M' '-Xdict-size' '1M')
+bootstrap_tarball_compression=(gzip -cn9)
 file_permissions=(
   ["/etc/shadow"]="0:0:400"
   ["/root"]="0:0:750"