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This commit implements automatic creation timestamp functionality for artifacts as requested in GitHub issue #27081, allowing users to see when artifacts were created. Changes made: - Add org.opencontainers.image.created annotation with Unix nanoseconds timestamp during artifact creation - Preserve original creation timestamp when using --append option - Update artifact inspect and add man pages to document the new functionality - Add comprehensive e2e and system BATS tests to verify creation timestamp behavior - Store timestamp as integer (Unix nanoseconds) for programmatic access The creation timestamp helps users understand artifact freshness, particularly useful for AI models and other time-sensitive artifacts managed by tools like RamaLama. Usage examples: podman artifact add myartifact:latest /path/to/file # Creates with timestamp podman artifact inspect myartifact:latest # Shows created annotation as integer podman artifact add --append myartifact:latest /file2 # Preserves original timestamp Fixes: https://github.com/containers/podman/issues/27081 Signed-off-by: Daniel J Walsh <dwalsh@redhat.com>