* Add support for MSC3916

* Add changelog

* Add tests for preview_url and config authenticated endpoints

* Add placeholder tests for downloads and thumbnails

* Test X-Matrix auth header stuff

* Validate signing keys more correctly

* Add early documentation for what this setup will look like

* Fix imports

* Update tests

* Add resolvematrix.dev tests

* Fix URL preview test

* Support receiving `/versions` and enabling MSC3916 support

* Remove placeholder docs

* Make outbound federation requests using MSC3916

* Validate X-Matrix destination correctly

* Factor out signing key generation

* Allow overriding the auth header in tests

* Print signing key path when printing domains

* Configure test MMR instances with a signing key

* Allow lazy ServeFile implementations

* Add federation download test

* Re-add merge conflicts in changelog

* Support http-only federation for tests

* Strip Go-added URI segments

* Fix test shutdown

* Remove unused test

* Enable failing tests

* Ensure signing keys exist inside container

* Fix signing key alignment between dependencies

* Ensure signing key information is carried into the config object

* Generally treat homeserver config a bite more safely

* Support and use new 3916v2 federation download URL

* Fix signing key permissions?

* Fix routing

* Update redirect-supporting behaviour

* Support redirects

* Finish tests

* Mark test function as deprecated to discourage use

* Avoid testcontainers tests from overwriting the config concurrently.

* host.docker.internal doesn't exist on linux

* Temporarily disable upload tests

* Support federation thumbnails again

* Fix tests for auth header

* Switch to stable endpoints

* Maybe use the correct stable endpoint too

* Revert "Temporarily disable upload tests"

This reverts commit e21fa0135b8fa880af7bbb7690e147a12946c28e.

* Try fixing tests

* Hardcode `host.docker.internal` again

* Fix redirect behaviour on federation

* Move endpoints to correct package

* Maybe remove the dev code

* Use a leaky bucket algorithm to limit download requests

* changelog

Fixes https://github.com/turt2live/matrix-media-repo/issues/428

To identify which of them deadlocks on close.

For https://github.com/turt2live/matrix-media-repo/issues/409
For https://github.com/turt2live/matrix-media-repo/issues/412

For https://github.com/turt2live/matrix-media-repo/issues/411

For https://github.com/turt2live/matrix-media-repo/issues/15

Fixes https://github.com/turt2live/matrix-media-repo/issues/188

This should help memory some more. See https://github.com/turt2live/matrix-media-repo/issues/237

Theory is that by dumping the streams we'll relieve any bytes held on by the S3 libraries. 

Includes early implementation of an embedded node, but not enabled because it breaks the whole compile chain.

The script appears to work, just needed some touchups.

Fixes https://github.com/turt2live/matrix-media-repo/issues/93

Fixes https://github.com/turt2live/matrix-media-repo/issues/39

Fixes https://github.com/turt2live/matrix-media-repo/issues/211