ci: fix the build after the image changes [1]
I have no idea why autoconf is broken like that [2]...
but seems to be the case so add sudo everywhere
$ ../autogen.sh --enable-gtk-doc --enable-vala
/usr/bin/autoconf: line 36: /dev/null: Permission denied
/usr/bin/autoconf: line 58: /dev/null: Permission denied
/usr/bin/autoconf: line 62: /dev/null: Permission denied
/usr/bin/autoconf: line 86: /dev/null: Permission denied
/usr/bin/autoconf: line 144: /dev/null: Permission denied
/usr/bin/autoconf: line 182: /dev/null: Permission denied
/usr/bin/autoconf: line 199: /dev/null: Permission denied
/usr/bin/autoconf: line 199: /dev/null: Permission denied
/usr/bin/autoconf: line 199: /dev/null: Permission denied
/usr/bin/autoconf: line 199: /dev/null: Permission denied
/usr/bin/autoconf: line 199: /dev/null: Permission denied
/usr/bin/autoconf: line 199: /dev/null: Permission denied
/usr/bin/autoconf: line 199: /dev/null: Permission denied
/usr/bin/autoconf: line 199: /dev/null: Permission denied
/usr/bin/autoconf: line 255: /dev/null: Permission denied
sh: /dev/null: Permission denied
sh: /dev/null: Permission denied
[1] https://gitlab.gnome.org/GNOME/librsvg-oci-images/-/merge_requests/9