feat(cli): add command to create custom OCI images from directories

[mudler]

Description

This PR introduces a new command, local-ai util create-oci-image , in the CLI to allow to create OCI images directly from source files or directory. this can be really handy to create backends for platforms that do not support docker natively such as macOS on arm64. This is required for #5790 in order to package the backend as OCI images (but the CI can't run docker on the first place).

How to use:

# Example usage: ./local-ai util create-oci-image <directory>
# Help
local-ai util create-oci-image --help

Usage: local-ai util create-image <input> ... [flags]

Create an OCI image from a file or a directory

Arguments:
  <input> ...    Input file or directory to create an OCI image from

Flags:
  -h, --help                      Show context-sensitive help.
      --log-level=LOG-LEVEL       Set the level of logs to output [error,warn,info,debug,trace] ($LOCALAI_LOG_LEVEL)

      --output="image.tar"        Output OCI image name
      --image-name="localai"      Image name
      --platform="linux/amd64"    Platform of the image

It includes the addition of a new command, CreateImageCMD, and its associated functionality. Below are the key changes:

New Feature: OCI Image Creation

• Imports Added: Added new imports for os, path/filepath, strings, and the archiver/v3 and oci packages to support file handling and OCI image creation.
• New Command Struct: Introduced the CreateImageCMD struct, which defines the input parameters for creating an OCI image, such as input files, output file name, image name, and platform.
• Command Logic: Implemented the Run method for CreateImageCMD, which:
  • Creates a temporary directory.
  • Archives the input files or directories into a tar file.
  • Uses the oci.CreateTar function to generate the OCI image with the specified parameters.

Notes for Reviewers

Signed commits

• Yes, I signed my commits.

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