provide more installation methods

[dafydd-t]

As well as providing the pre-built releases for various destinations, we should support other, more convenient installation methods. These could include:

• homebrew (mac)
• scoop (windows)
• pacman (arch linux)
• snap (ubuntu)
• ...

Take a look at grafana/agent to see what we support there.

[nckswt]

Just noting that the most useful thing for us would be a guide to connect into an AWS-managed VPC.

I'm in the process of setting up an always-on EC2 instance to handle PDC traffic, but I'd much rather have another config (e.g. Fargate, ECS or even Lambda if that's possible) that autoscales based on traffic needs.

(Though I recognize those aren't exactly "installation methods". Happy to break this out to a new issue if you'd like.)

[dafydd-t]

@nckswt You need the pdc-agent to be running so that an SSH tunnel is established from within your network to the Grafana Cloud infrastructure. Therefore on-demand choices like lambda will not be suitable.

Please could you create a new issue for the rest, then we can consider it separately 👍