Revert "Update alpine Docker tag to v3.14"

See merge request !3

This reverts commit 7167f5a9

Update alpine Docker tag to v3.14

See merge request !2

Configure Renovate

See merge request !1

docker run vs create

I think the docker command should be "run" not create as you are expecting a running container in the next step

If I'm right - this change should help other newcomers

Expose port 80.

Allows solutions using https://github.com/nginx-proxy/nginx-proxy to avoid having to make the localhost binding.

Set permissions on startup

Setup permissions for container-internal directories

Remove chmod and chown on startup (fixes #30)

When booting the container, an `mkdir: can't create directory '/data': File exists` error is printed to the logs. Irritatingly, nothing gets printed after this error for a while since the chown/chmod calls may take a while to complete, so the user may get the impression the container failed to start up.

Revert to apline:3.10 to stay on Python 3.7

(3.8 has issues with channels)

Updated to alpine:3.11 and disabled package cache to reduce image size

Disable celerybeat pid file

Cf funkwhale!986 and funkwhale#1004

Support setting CELERYD_CONCURRENCY to control number of spawned worker processes

Fix #25

0.20.x requires service_identity

Cover art missing when using reverse proxy