backend/v0.6.0

For this release, we focused on making smaller improvements and fixing things. The highlights are:
- Added support for 3rd-party identity providers in cross-domain setups
- Added endpoints and UI for self-service account deletion
- Config simplified with regards to CORS

## What's Changed
* fix(example): do not copy lockfiles not under vc in dockerfiles by @lfleischmann in https://github.com/teamhanko/hanko/pull/661
* feat: make conditional ui available via env var in quickstart by @like-a-bause in https://github.com/teamhanko/hanko/pull/653
* fix(frontend): make compose debug work again by @lfleischmann in https://github.com/teamhanko/hanko/pull/658
* feat: user deletion by @bjoern-m in https://github.com/teamhanko/hanko/pull/662
* Fix: Ci Dependabot producing failing builds by @like-a-bause in https://github.com/teamhanko/hanko/pull/656
* `isready` subcommand to check if a service is ready to serve requests by @IgnisDa in https://github.com/teamhanko/hanko/pull/698
* feat: add info about android apk key hash by @FreddyDevelop in https://github.com/teamhanko/hanko/pull/708
* ci(docs): deploy only on backend tag or workflow dispatch by @lfleischmann in https://github.com/teamhanko/hanko/pull/710
* feat: social login in a cross domain setting by @lfleischmann in https://github.com/teamhanko/hanko/pull/701
* refactor(cmd): rework config initalization by @lfleischmann in https://github.com/teamhanko/hanko/pull/712
* Test improve integration tests by @FreddyDevelop in https://github.com/teamhanko/hanko/pull/706
* Feat simplify config by @like-a-bause in https://github.com/teamhanko/hanko/pull/635
* fix: use uuid for docker database container names in test by @like-a-bause in https://github.com/teamhanko/hanko/pull/727
* fix(deploy): copy missing directory in backend debug dockerfile by @lfleischmann in https://github.com/teamhanko/hanko/pull/733

## New Contributors
* @IgnisDa made their first contribution in https://github.com/teamhanko/hanko/pull/698

**Full Changelog**: https://github.com/teamhanko/hanko/compare/backend/v0.5.0...backend/v0.6.0