Meetings bot setup: Remove the SQL injection, use admin API

[jaller94]

I'll need help to

• if there's already a Synapse Admin Access Token to be used (of if a new user and token needs to be created)
• define a variable like .Values.init.nodejs.image if we don't want a specific NodeJS image from DockerHub hard-coded

[changeset-bot]

⚠️ No Changeset found

Latest commit: de56cc6

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes no changesets

When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types

Click here to learn what changesets are, and how to add one.

Click here if you're a maintainer who wants to add a changeset to this PR

[HarHarLinks]

need to check if this is referenced somewhere and needs replacing

for example
https://github.com/nordeck/matrix-meetings/blob/main/charts/matrix-meetings-bot/templates/configmap.yaml#L7

[HarHarLinks]

since we don't really need psql anymore, let's get rid of it entirely

[HarHarLinks]

as discussed we should:

• sort the getFreshDeviceToken step before the disableRateLimitInDB
• regardless, make the disableRateLimitInDB "atomic" by adding login and logout step to get a token

[HarHarLinks]

We overlooked that the bot does not use an admin account, so this solution is not that simple after all