When we tried to build debs for 1.13.0, the build failed because docker used a
base docker image which had a stale apt cache.

Fixes: #7540

Lots of people seem to get confused by this mode, and it's been deprecated
since Synapse 1.1.0. It's time for it to go.

* Add working build command for docker image

* Add changelog

Signed-off-by: Tobia De Koninck <LEDfan@users.noreply.github.com>

Turns out that loggers that are instantiated before the config is loaded get
turned off.

Also bring the logging config that is generated by --generate-config into line.

Fixes #6194.

* Allow passing SYNAPSE_WORKER envvar

* changelog.d

* Document SYNAPSE_WORKER.

Attempting to imply that you don't need to change this default
unless you're in worker mode.

Also aware that there's a bigger problem of attempting to document
a complete working configuration of workers using docker, as we
currently only document to use `synctl` for worker mode, and synctl
doesn't work that way in docker.

Adjust su-exec to only be used if needed.

If UID == getuid() and GID == getgid() then we do not need to su-exec, and chmod will not work.

* Fix debian packages for sid being called buster.

I don't know why the sid images return buster as its codename in
`lsb_release` but it does, so lets just grab the codename from the
distro we pass into dockerfile

* Newsfile

This is basically a contrived way of adding a `Recommends` on `libpq5`, to fix #5653.

The way this is supposed to happen in debhelper is to run
`dh_shlibdeps`, which in turn runs `dpkg-shlibdeps`, which spits things out
into `debian/<package>.substvars` whence they can later be included by
`control`.

Previously, we had disabled `dh_shlibdeps`, mostly because `dpkg-shlibdeps`
gets confused about PIL's interdependent objects, but that's not really the
right thing to do and there is another way to work around that.

Since we don't always use postgres, we don't necessarily want a hard Depends on
libpq5, so I've actually ended up adding an explicit invocation of
`dpkg-shlibdeps` for `psycopg2`.

I've also updated the build-depends list for the package, which was missing a
couple of entries.

This adds a missing space, without which log lines appear uglier.

Signed-off-by: Slavi Pantaleev <slavi@devture.com>

Alpine Linux 3.8 is still supported, but it seems like
it's quite outdated now.

While Python should be the same on both, all other libraries, etc.,
are much newer in Alpine 3.9 and 3.10.

Signed-off-by: Slavi Pantaleev <slavi@devture.com>

Removes any `SMTP_*` docker container environment variables from having any effect on the default config.

Fixes https://github.com/matrix-org/synapse/issues/5430

Signed-off-by: Amir Zarrinkafsh <nightah@me.com>

... to help people escape env var hell

There's not much point in binding to localhost when it's in a docker container.

This is mostly a documentation change, but also adds a default value for
SYNAPSE_CONFIG_PATH, so that running from the generated config is the default,
and will Just Work provided your config is in the right place.

When running under docker, we want to use docker's own logging stuff rather
than losing the logs somewhere on the container's filesystem, so let's use log
configs that spit logs out to stdout instead.

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.)

... and inline generate_secrets

Fixes #3370.

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

Fixes #5467.

because this file is reproduced on dockerhub and relative paths don't work

Add missing backslash