Fix security issue.

See merge request famedly/conduit!316

Fix crash when a bad user ID is in the database

See merge request famedly/conduit!334

To my understanding, a bad user ID can sometimes make it into the
database, which lead to a panic prior to this change.

chore: Bump alpine version for CI generated docker

See merge request famedly/conduit!333

chore(docker): Bump alpine (base image) version

Closes #255

See merge request famedly/conduit!330

Use native root CA certificates for reqwest

See merge request famedly/conduit!329

Fix proxy config examples in config/proxy.rs

See merge request famedly/conduit!321

CI: Fix musl builds

See merge request famedly/conduit!328

This pins the image to use for cross to a working image's sha256

Fix permissions

See merge request famedly/conduit!317

The docs state that you need to make the config file _readable_
and then proceeds to make the file writable.

This changes it to make the file to be owned by root and readable by
anyone. This is the default for unix / linux and suggested practice
for files in /etc.

Fix(docker): Make conduit own default db path

See merge request famedly/conduit!320

When a user mounts a volume into the default volume path,
it uses the permissions and ownership from the host volume.
In most cases, this is 1000:1000, which it also uses on the inside.

If you don't mount a volume though (e.g., for testing), conduit cries:
“The database couldn't be loaded or created.”

This fix chowns the default db dir to remedy this.

The text just sets the ownership and ignores that defaults on unix
are to have newly created dirs be readable by everyone.
This closes the database to unauthorized users on multi-user systems.

docs: make all configs match

Closes #205

See merge request famedly/conduit!301

Improve docker documentation some

See merge request famedly/conduit!314

Remove the now obsolete cross readme

See merge request famedly/conduit!315

CI: audit dependencies

See merge request famedly/conduit!313

Update Ruma

See merge request famedly/conduit!312

Slight clarification

See merge request famedly/conduit!310

Redaction fix

Closes #235

See merge request famedly/conduit!298

Remove useless serde roundtrips

See merge request famedly/conduit!311

Which version it started being beta in is quite irrelevant here.

Add a not-found route

See merge request famedly/conduit!306

Provide some sane defaults for vscode developing

See merge request famedly/conduit!309