Dont use platform separator for docker build paths.

[claudevdm]

Fixes #36557

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Summary of Changes

Hello @claudevdm, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request addresses a cross-platform compatibility issue in the Docker container build process for Apache Beam's Python SDK. Previously, platform-specific path separators could be used in Docker image names, leading to build failures on certain operating systems. The change ensures that all Docker image paths are constructed with consistent forward slashes, making the build process more reliable across different environments. A dedicated test case has also been introduced to validate this behavior.

Highlights

• Docker Image Path Separator Fix: The pull request updates the sdk_container_builder.py to use posixpath.join instead of os.path.join when constructing Docker container image names. This change ensures that forward slashes are consistently used as path separators, preventing issues that arise on non-POSIX systems (like Windows) where os.path.join might introduce backslashes, which are invalid in Docker image names.
• New Unit Test for Path Separators: A new unit test, test_container_image_name_uses_forward_slashes, has been added to sdk_container_builder_test.py. This test explicitly verifies that the generated Docker container image names correctly utilize forward slashes, thereby confirming the fix and enhancing cross-platform robustness.

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R: @tvalentyn for label python.

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