Cloud9 hassio addon pylint

I’m using the Cloud9 IDE addon, but it seems to be missing pylint. I’m wondering if anyone else has configured or installed pylint to use with the addon.

I tried using the packages in the config to include py3-pylint:

{
  "ssl": true,
  "certfile": "fullchain.pem",
  "keyfile": "privkey.pem",
  "packages": [
    "py3-pylint"
  ],
  "init_commands": []
}

but I get this error when starting the app with that configuration

[s6-init] making user provided files available at /var/run/s6/etc...exited 0.
[s6-init] ensuring user provided files have correct perms...exited 0.
[fix-attrs.d] applying ownership & permissions fixes...
[fix-attrs.d] 10-hassio: applying... 
[fix-attrs.d] 10-hassio: exited 0.
[fix-attrs.d] done.
[cont-init.d] executing container initialization scripts...
[cont-init.d] 00-banner.sh: executing... 
-----------------------------------------------------------
 Hass.io Add-on: IDE
 Advanced IDE for Home Assistant, based on Cloud9 IDE
-----------------------------------------------------------
 Add-on version: 1.0.0
 You are running the latest version of this add-on.
 System: HassOS 2.12  (armv7 / raspberrypi3)
 Home Assistant version: 0.93.2
 Supervisor version: 166
-----------------------------------------------------------
 Please, share the above information when looking for help
 or support in, e.g., GitHub, forums or the Discord chat.
-----------------------------------------------------------
[cont-init.d] 00-banner.sh: exited 0.
[cont-init.d] 01-log-level.sh: executing... 
[cont-init.d] 01-log-level.sh: exited 0.
[cont-init.d] c9.sh: executing... 
fetch http://dl-cdn.alpinelinux.org/alpine/v3.9/main/armv7/APKINDEX.tar.gz
fetch http://dl-cdn.alpinelinux.org/alpine/v3.9/community/armv7/APKINDEX.tar.gz
fetch http://dl-cdn.alpinelinux.org/alpine/edge/main/armv7/APKINDEX.tar.gz
fetch http://dl-cdn.alpinelinux.org/alpine/edge/community/armv7/APKINDEX.tar.gz
fetch http://dl-cdn.alpinelinux.org/alpine/edge/testing/armv7/APKINDEX.tar.gz
v3.9.4-24-g4e2ff29bbe [http://dl-cdn.alpinelinux.org/alpine/v3.9/main]
v3.9.4-13-g22588a32d0 [http://dl-cdn.alpinelinux.org/alpine/v3.9/community]
v3.10.0_rc2-100-g250d19e252 [http://dl-cdn.alpinelinux.org/alpine/edge/main]
v3.10.0_rc2-130-g416c2dd2d0 [http://dl-cdn.alpinelinux.org/alpine/edge/community]
v3.10.0_rc2-60-ga3df4f4cbf [http://dl-cdn.alpinelinux.org/alpine/edge/testing]
OK: 23140 distinct packages available
ERROR: unsatisfiable constraints:
  readline-7.0.003-r1:
    conflicts: readline-8.0.0-r0
    satisfies: bash-4.4.19-r1[so:libreadline.so.7]
               sqlite-3.26.0-r3[so:libreadline.so.7]
               python2-2.7.15-r3[so:libreadline.so.7]
  readline-8.0.0-r0:
    masked in: @edge
    conflicts: readline-7.0.003-r1
    satisfies: python3-3.7.3-r0[so:libreadline.so.8]
  python3-3.7.3-r0:
    masked in: @edge
    satisfies: py3-wrapt-1.11.1-r0[python3]
               py3-wrapt-1.11.1-r0[so:libpython3.7m.so.1.0]
               py3-setuptools-40.6.3-r0[python3]
               py3-isort-4.3.4-r0[python3]
               py3-typed-ast-1.3.5-r0[python3]
               py3-typed-ast-1.3.5-r0[so:libpython3.7m.so.1.0]
               py3-lazy-object-proxy-1.4.1-r0[python3]
               py3-lazy-object-proxy-1.4.1-r0[so:libpython3.7m.so.1.0]
               py3-mccabe-0.6.1-r1[python3]
               py3-six-1.11.0-r0[python3]
  py3-lazy-object-proxy-1.4.1-r0:
    masked in: @edge
    satisfies: py3-astroid-2.2.5-r0[py3-lazy-object-proxy]
  py3-typed-ast-1.3.5-r0:
    masked in: @edge
    satisfies: py3-astroid-2.2.5-r0[py3-typed-ast]
  py3-wrapt-1.11.1-r0:
    masked in: @edge
    satisfies: py3-astroid-2.2.5-r0[py3-wrapt]
  py3-astroid-2.2.5-r0:
    masked in: @edge
    satisfies: py3-pylint-2.3.1-r0[py3-astroid]
  py3-pylint-2.3.1-r0:
    masked in: @edge
    satisfies: world[py3-pylint]
[22:46:36] FATAL: Failed installing package py3-pylint
[cont-init.d] c9.sh: exited 1.
[cont-finish.d] executing container finish scripts...
[cont-finish.d] 99-message.sh: executing... 
-----------------------------------------------------------
                Oops! Something went wrong.

 We are so sorry, but something went terribly wrong when
 starting or running this add-on.
 
 Be sure to check the log above, line by line, for hints.
-----------------------------------------------------------
[cont-finish.d] 99-message.sh: exited 0.
[cont-finish.d] done.
[s6-finish] waiting for services.
[s6-finish] sending all processes the TERM signal.