Fix prow-tests Dockerfile
@@ -48,7 +48,7 @@ RUN bazel version > /bazel_version
RUN bazel shutdown
# Extract ko version
-git ls-remote https://github.com/google/ko HEAD | cut -f1 > /ko_version
+RUN git ls-remote https://github.com/google/ko HEAD | cut -f1 > /ko_version
# Extra tools through gem
RUN gem install mixlib-config -v 2.2.4 # required because ruby is 2.1
