this makes docker builds a bit faster.

Docker image: add support for SYNAPSE_DATA_DIR parameter

Docker: only run --generate-keys when generating config on-the-fly.

Refactor the docker/start.py script

Update purge_api README

Update HAProxy example rules

Signed-off-by: Jon Richter <jon@allmende.io>

This points the reverse links at the intended location.

Fixes #4830.

We don't want to generate any missing configs when running from a precanned
config.

(There's a strong argument that we don't want to do this at all, since
generating a new signing key on each invocation sounds disasterous, but I don't
fancy unpicking that for now.)

Fixes #4901

* master:
  Fix broken link in MSC1711 FAQ
  Update changelog to better expain password reset change (#5545)

* release-v1.0.0:
  Update changelog to better expain password reset change (#5545)

... and inline generate_secrets

Closes #4583

Does slightly less than #5045, which prevented a room from being upgraded multiple times, one after another. This PR still allows that, but just prevents two from happening at the same time.

Mostly just to mitigate the fact that servers are slow and it can take a moment for the room upgrade to actually complete. We don't want people sending another request to upgrade the room when really they just thought the first didn't go through.

Fixes #3370.

Python 3.7 is apparently faster than 3.6, and should be mature enough.

Updates the v1.0.0 changelog to provide more information to those upgrading to v1.0 on why they may receive errors or find their password reset abilities have now been disabled.

Helps address #5444

Fixes #5533

Adds information about how to install and run black on the codebase.

Add --data-dir and --open-private-ports options.

Stop conflating generated config and default config

Cleanups and sanity-checking in cpu and db metrics

Split public rooms directory auth config in two

Fix /messages on workers when no from param specified.