fix Dockerfile

[fyang93]

Description

On L74, if [ "USE_CUDA_VERSION" ]; is fixed to if [ "$USE_CUDA_VERSION" ];.
No dependencies are required for this change.

Type of change

• Bug fix (non-breaking change which fixes an issue)

Feature/Issue validation/testing

Run ./build_image.sh -cv cu118 -py 3.9 -t torchserve:dev-base &> build.log.
Without the fix, you may find [compile-image 8/9] RUN ... if [ "USE_CUDA_VERSION" ]; then ... in build.log, after the fix, the log would be [compile-image 8/9] RUN ... if [ "cu118" ]; then ... which is the original author's intention in my understanding.

Checklist:

• Did you have fun?
• Have you added tests that prove your fix is effective or that this feature works?
• Has code been commented, particularly in hard-to-understand areas?
• Have you made corresponding changes to the documentation?

[agunapal]

Thanks for reporting the issue.

[agunapal]

LGTM