chore: add tests for build docker image when dockerfile changed

[bowenliang123]

Summary

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• add CI test job for building docker images for API and web module, only triggered when the dockerfile changed
• to ensure the required os and packages (eg. native packages and building environment on os) are installable and ready to build, in particular, aligning with the correct pinned version code and combination for chip platforms.
• build docker images for multi platforms of linux/amd64 and linux/arm64
• the built images will NOT be pushed to Docker Hub
• the docker build summary will be appended to the CI job's summary

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Checklist

Important

Please review the checklist below before submitting your pull request.

• This change requires a documentation update, included: Dify Document
• I understand that this PR may be closed in case there was no previous discussion or issues. (This doesn't apply to typos!)
• I've added a test for each change that was introduced, and I tried as much as possible to make a single atomic change.
• I've updated the documentation accordingly.
• I ran dev/reformat(backend) and cd web && npx lint-staged(frontend) to appease the lint gods