[Bugfix] Fix issues in CPU build Dockerfile. Fixes #9182

[terrytangyuan]

Fixes #9182. This fixes the following two issues. Verified that build is successful after these changes.

Issue 1:

ERROR: Could not open requirements file: [Errno 13] Permission denied: 'requirements-build.txt'

Issue 2:

LookupError: setuptools-scm was unable to detect version for /workspace/vllm

Related issues #9182 and #8502

[github-actions]

👋 Hi! Thank you for contributing to the vLLM project.
Just a reminder: PRs would not trigger full CI run by default. Instead, it would only run fastcheck CI which starts running only a small and essential subset of CI tests to quickly catch errors. You can run other CI tests on top of those by going to your fastcheck build on Buildkite UI (linked in the PR checks section) and unblock them. If you do not have permission to unblock, ping simon-mo or khluu to add you in our Buildkite org.

Once the PR is approved and ready to go, your PR reviewer(s) can run CI to test the changes comprehensively before merging.

To run CI, PR reviewers can do one of these:

• Add ready label to the PR
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🚀

[DarkLight1337]

cc @dtrifiro

[terrytangyuan]

@dtrifiro is on vacation

[DarkLight1337]

I see, thanks for the heads up!

[DarkLight1337]

Can you add a TODO that links to #9182 (comment) so we might come up with a better solution in the future?

[DarkLight1337]

Also, maybe we can mark this PR as fixing #9182?

[terrytangyuan]

Updated. Thanks!

[DarkLight1337]

LGTM now, thanks for fixing!

[terrytangyuan]

Looks like build failure may not be related since ppc64le is failing but I didn't modify Dockerfile.ppc64le.

[DarkLight1337]

Can you merge from main? It should fix the CI failures.

[terrytangyuan]

Looks like it's still failing.

[DarkLight1337]

Retrying the test...