Some systems (like nixos) don't have bash living at `/bin/bash` so using
`/usr/bin/env bash` we can make these scripts universal.
### Pull Request Checklist
<!-- Please read docs/CONTRIBUTING.md before submitting your pull
request -->
* [X] I have added added tests for PR _or_ I have justified why this PR
doesn't need tests.
* [x] Pull request includes a [sign
off](https://github.com/matrix-org/dendrite/blob/main/docs/CONTRIBUTING.md#sign-off)
Signed-off-by: `Dov Alperin <git@dov.dev>`
Signed-off-by: `Dov Alperin <git@dov.dev>`
* Initial work oon multipersonality binary
* Remove old binaries
* Monolith and polylith binaries
* Better logging
* dendrite-poly-multi
* Fix path
* Copyright notices etc
* Tweaks
* Update Docker, INSTALL.md
* Take first argument if flags package doesn't find any args
* Postgres 9.6 or later, fix some more Docker stuff
* Don't create unnecessary e2ekey DB
* Run go mod tidy
* Rename serverkeyapi to signingkeyserver
We use "api" for public facing stuff and "server" for internal stuff.
As the server key API is internal only, we call it 'signing key server',
which also clarifies the type of key (as opposed to TLS keys, E2E keys, etc)
* Convert docker/scripts to use signing-key-server
* Rename missed bits
