Very large slugs

[kholbekj]

Hey there, sorry if this is somehow self-infliced, but it seems to me that the buildpack is pulling in a bunch of stuff, like firefox, which is taking up hundreds of megabytes of slug. My aptfile:

libglib2.0-0
libglib2.0-dev
libpoppler-glib8
libvips-dev
libvips

My .apt folder on a live dyno:

# .apt/
1.5M    bin
344K    etc
11M     lib
192K    sbin
444M    usr
44K     var

---

# .apt/usr/lib/
4.0K    binfmt.d
56K     dbus-1.0
4.0K    environment.d
235M    firefox
20K     firefox-addons
72K     girepository-1.0
44K     groff
24K     kernel
408K    man-db
16K     mime
4.0K    modules-load.d
28K     networkd-dispatcher
1.2M    python3
12K     sysctl.d
448K    systemd
16K     sysusers.d
52K     tmpfiles.d
92M     x86_64-linux-gnu

Can I prevent this behaviour somehow?