Prepare for ARM

[guigomcha]

Is your feature request related to a problem? Please describe.

Alumet can be used in linux ARM (e.g., raspberry pi) but it requires some adjustments

Describe the solution you'd like

We need to be able to have the complete chain of repos updated to deliver an ARM-compatible Alumet agent:

• src: dependencies + logic to build/select compatible plugins
• package: build for ARM deb, rpm and docker image
• helm-chart: Should take the right image automatically if we push an OCI multi-architecture manifest

Additional context

Already tested manually that it can be achieved by shipping a arm-docker image with a custom build of alumet.