Ensure Container Job Uses a Version Digest

Using version digests for container jobs in Azure Pipelines is recommended because:

• Version digests guarantee that the image is immutable and will not change or be deleted, even if the tag does. This avoids unexpected behavior or errors in the pipelines.
• Version digests enable a clear history of what image was used for a specific build or deployment, which allows easy tracking and auditing of the origin and quality of your container images.
• Version digests follow semantic versioning, which is a widely used way of indicating the compatibility and stability of software releases.
  Therefore, this rule suggests using version digests instead of tags when specifying a container image for your job.