Add docker images size change check

[ZePan110]

Description

Add docker images size change check

1. Overwrite the last automatic comment and keep only the last one.
2. Keep the results of each commit in the workflow summary page.

Issues

opea-project/GenAIComps#1783

Type of change

List the type of change like below. Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds new functionality)
• Breaking change (fix or feature that would break existing design and interface)
• Others (enhancement, documentation, validation, etc.)

Dependencies

List the newly introduced 3rd party dependency if exists.

Tests

Test pssed:
https://github.com/opea-project/GenAIExamples/actions/runs/16362800522
#2133 (comment)

[github-actions]

Dependency Review

✅ No vulnerabilities or license issues found.

Scanned Files

• .github/workflows/pr-image-size.yml

[Copilot]

Pull Request Overview

This PR introduces a GitHub Actions workflow that detects changes to Dockerfiles in pull requests, builds both the base and PR versions of each image, and reports size differences.

• Identifies changed Dockerfiles in the PR.
• Builds images from the base branch and PR branch.
• Outputs byte-level size changes for each Dockerfile.

Comments suppressed due to low confidence (2)

.github/workflows/pr-image-size.yml:34

• In case of renamed Dockerfiles, git diff --name-status outputs both old and new paths (old in $2, new in $3). Currently you're always picking $2, which will miss the new filename on renames. Consider checking the status code and using $3 for 'R' entries.

          files=$(git diff --name-status --diff-filter=ARM ${{ github.event.pull_request.base.sha }} ${merged_commit} | awk '{print $2}' | grep -E 'Dockerfile$' || true)

.github/workflows/pr-image-size.yml:50

• Only checking out the Dockerfile from the base branch means the build context still includes PR changes to other files, which may lead to incorrect size comparisons. It would be more accurate to checkout the entire directory (or full repo) at the base commit before building.

            git checkout origin/${{ github.base_ref }} -- "$dockerfile"

[github-actions]

ℹ️ INFO
File AudioQnA/Dockerfile resulted in a change in the image size from 422 -> 422 MB (diff: 0 MB)

[chensuyue]

"File 'MultimodalQnA/Dockerfile' resulted in a change in the image size from 422 -> 422 MB (diff: 0 MB) File 'SearchQnA/ui/docker/Dockerfile' resulted in a change in the image size from 1413 -> 1413 MB (diff: 0 MB) "

Please remove " in the head and end, make the log in good shape.

[chensuyue]

"File 'MultimodalQnA/Dockerfile' resulted in a change in the image size from 422 -> 422 MB (diff: 0 MB) File 'SearchQnA/ui/docker/Dockerfile' resulted in a change in the image size from 1413 -> 1413 MB (diff: 0 MB) "

Please remove " in the head and end, make the log in good shape.

Maybe shows a warning like this:

⚠️ WARNING
File xxx/Dockerfile resulted in a change in the image size from 5500 -> 5600 MB (diff: 100 MB)

File 'MultimodalQnA/Dockerfile' resulted in a change in the image size from 422 -> 422 MB (diff: 0 MB)  
File 'SearchQnA/ui/docker/Dockerfile' resulted in a change in the image size from 1413 -> 1413 MB (diff: 0 MB)

[ZePan110]

ℹ️ just test comment