Corteca Toolchain based on Alpine

This is the Corteca Toolchain image based on ALpine Linux instead of Buildroot. We create a multiplatform image for the following architectures:

• armv7l
• aarch64 (aka arm64, armv8)
• x86_64 (aka amd64)

Initial release of corteca-toolchain

Merge pull request #1 from nokia/v23.12.1

add corteca toolchain v23.12.1