feat(docker): Add stream_progress_to parameter to DockerImage

[wavebyrd]

Summary

• Adds stream_progress_to parameter to DockerImage class
• Allows users to stream docker build and push output to stdout or any other TextIO stream
• By default, output is suppressed (existing behavior unchanged)

Changes

• Added stream_progress_to: Optional[TextIO] parameter to DockerImage.__init__
• Pass it through to build_image() which already supports streaming
• Added streaming support to push() method as well
• Updated docstring to document the new parameter

Example usage

import sys
from prefect.docker import DockerImage

# Stream build and push output to stdout
image = DockerImage(name="my-image", stream_progress_to=sys.stdout)
image.build()  # Build output will be streamed to stdout
image.push()   # Push output will be streamed to stdout

Test plan

• Create a DockerImage with stream_progress_to=sys.stdout and verify build output is streamed
• Create a DockerImage without stream_progress_to and verify output is suppressed (default)
• Verify push output streaming works correctly

Closes #18393

🤖 Generated with Claude Code

[desertaxle]

@wavebyrd please rebase this PR so that it includes only the changes described in the PR description.