[enhacement] Speed up gh oci-build action (Move to new gh linux arm64 runners)

[adrianriobo]

Currently we build multi-arch images on an x86 ubuntu runner, so the emulation of arm64 to build the arch is taking a lot of time. We can customize a bit the action to speed up things:

• Review Containerfile to ensure the strategy for partial images (images built which can be cached)
• Add cache for images path on the runners
• Split the build in parallel: one runner x86 one runner (emulated) arm64

[adrianriobo]

We can make use of new added linux-arm64 runners to avoid emulate arm64 builds which are really time consuming

https://github.blog/changelog/2025-01-16-linux-arm64-hosted-runners-now-available-for-free-in-public-repositories-public-preview/