Add pipeline job to build and create images

[zarfld]

Related to #85

Update create_images.sh to build and create images for Raspberry Pi 4 Bullseye, Bookworm, and amd64 hybrid.

• Raspberry Pi 4 Bullseye:

  • Cross-compile for ARM.
  • Ensure image follows LinuxCNC structure.
  • Create and test the image.

• Raspberry Pi 4 Bookworm:

  • Cross-compile for ARM.
  • Ensure image follows LinuxCNC structure.
  • Create and test the image.

• amd64 Hybrid:

  • Natively compile for amd64.
  • Ensure image follows LinuxCNC structure.
  • Create and test the image.

• Documentation:

  • Add sections on using the create_images.sh script, testing and validating generated images, and uploading images to the repository's releases or cloud storage platform in docs/README.md.

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