Add numpy dep to build workflow.
diff --git a/.github/workflows/build_package.yml b/.github/workflows/build_package.yml
index d2e634a..1253bbc 100644
--- a/.github/workflows/build_package.yml
+++ b/.github/workflows/build_package.yml
@@ -28,7 +28,13 @@
echo "GITHUB_WORKSPACE=${GITHUB_WORKSPACE}"
echo "PWD=${PWD}"
echo "PATH=${PATH}"
-
+ - name: Install python deps
+ shell: bash
+ run: |
+ # We aren't actually building anything that requires this, but the
+ # TensorFlow build hard fails without it, even though we are only
+ # building C++ (facepalm).
+ python -m pip install numpy
- name: Configure
shell: bash
run: |