Fixes#1157
Adds `./btrix setup` command to `btrix` helper which copies the example
local config to `./chart/local.yaml` where `btrix` expects it.
If another command is run when the local config file doesn't yet exist,
the helper will stop and suggest to the user to run `./btrix setup` and
edit the resulting file.
* Add success filter to webhook list GET endpoint
* Add sorting to webhooks list API and add event filter
* Test webhooks via echo server
* Set address to echo server on host from CI env var for k3d and microk8s
* Add -s back to pytest command for k3d ci
* Change pytest test path to avoid hanging on collecting tests
* Revert microk8s to only run on push to main
