Embed git commit hash into Python source

.github/actions/nm-build-vllm/action.yml

@@ -30,6 +30,14 @@ runs:
     run: |
       COMMIT=${{ github.sha }}
       VENV="${{ inputs.venv }}-${COMMIT:0:7}"
+
+      # add githash `to version.py` and include in 'all' for `vllm/__init__.py`
+      echo "__githash__ = '$COMMIT'" >> vllm/version.py
+      # update import line
+      sed -i 's/import __version__/import __githash__, __version__/' vllm/__init__.py
+      # update "__all__" list
+      sed -i 's/"__version__",/"__githash__",\n    "__version__",/' vllm/__init__.py
+
       source $(pyenv root)/versions/${{ inputs.python }}/envs/${VENV}/bin/activate
       # TODO: adjust when we need a proper release. use nightly now.
       pip3 install -r requirements-cuda.txt -r requirements-build.txt