Deploy PVWS somewhere

[rerpha]

As a developer I would like to deploy an instance of PVWS, which this dashboard relies on, so that we can use it for R55 and R80 PVs. The web dashboard is already deployed to github pages, but relies on a PVWS running on the same host as the user's web browser which obviously isn't an option.

This will involve finding a suitable host and then deploying natively (on a tomcat 9.x server) or using a docker container (see pvws repo for how to do this)

PVWS is fine to be left public-facing, in fact we will require it to be if we deploy the webdashboard as a user's browser will be directly streaming from the websocket it serves. It will need to be left in the default mode of read-only.

PVWS should only require port 8080 (or whatever tomcat port is chosen) to be outward facing, CA ports should only be internal-facing. We should make sure it is pointing at a CA gateway

Acceptance criteria

• Host is found
• host deployed to using latest nightly build
• https://github.com/ISISComputingGroup/WebDashboard/blob/main/.env is updated to point at the PVWS instance by default
• https://github.com/ISISComputingGroup/WebDashboard?tab=readme-ov-file#running is updated to say "if you don't want to point your instance to the deployed websocket at {wherever it ends up}"

[Tom-Willemsen]

@FreddieAkeroyd was looking at a new server recently which may be more suitable than current location.

[KathrynBaker]

Running in one location, awaiting conformation of the appropriate place, hence impeded