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

Fix permissions

See merge request famedly/conduit!317

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

This includes some extensions and a debug profile

CI: Lint dockerfiles with hadolint

Closes #239

See merge request famedly/conduit!308

Ci fix tag pipelines

Closes #229

See merge request famedly/conduit!307