Arm agents

[6543]

current error:

{"time":"2023-08-16T19:18:37Z","message":"Starting autoscaler with log-level=info"}
{"level":"info","agent":"pool-1-agent-TAUE","time":"2023-08-16T19:19:37Z","message":"deploying agent"}
{"level":"error","error":"hetznercloud: image has incompatible architecture (invalid_input)","time":"2023-08-16T19:19:37Z","message":"creating agents failed"}
{"level":"info","agent":"pool-1-agent-TAUE","reason":"not found on provider","time":"2023-08-16T19:20:37Z","message":"remove agent"}

[6543]

depend on woodpecker-ci/autoscaler#10

[6543]

depend on woodpecker-ci/autoscaler#12
and on woodpecker-ci/woodpecker#2232

[anbraten]

We should implement woodpecker-ci/autoscaler#72 to easily be able to have arm and amd64 agents be deployed as needed.

[anbraten]

replaced by #15