Fixed a federation issue related to images

See merge request !1024

Add deps for pillow in docker image

See merge request !1023

Allow files with upper case extensions when uploading avatar

See merge request !1022

Discovered when attempting to upload a file with name avatar.JPG

The following error was reported in the logs:
```
File "/app/funkwhale_api/common/serializers.py", line 213, in to_internal_value
     format=PIL.Image.EXTENSION[os.path.splitext(file_obj.name)[-1]],
 KeyError: '.JPG'
```

Update dev.yml - Update swagger-ui docker image

See merge request !1021

Update docker-compose.yml to use redis v5

Closes #1021

See merge request !1016

Fix #1021

Update frontend Dockerfile to Node 12.14-Buster from Node 11-Stretch

See merge request funkwhale/funkwhale!1018

Update Dockerfile to use Alpine 3.11

See merge request !1017

Reduce size of image by using --no-cache

Use Node 12 (most recent LTS version)

See merge request !1019

See #170: RSS feeds for channels

See merge request !1015

See #170: added proper meta and support embed for channels

See merge request !1014

See #170: include channel info in artist representations

See merge request !1013

See #170: don't expose channels libraries in API

See merge request funkwhale/funkwhale!1012

See #170: can now filter tracks and albums by channel

See merge request !1006

Fixed broken pagination in uploads table

See merge request !1011

Fix #348, #474, #557, #740, #928: improved deduplication logic to prevent skipped uploads

Closes #928, #740, #557, #474, and #348

See merge request !1010

Fix #348, #474, #557, #740, #928: improved deduplication logic to prevent skipped files during import

Fix #1018: broken artist cards

Closes #1018

See merge request !1009

Fix #1015: broken migration on S3

Closes #1015

See merge request !1007