run_tests.bash fails with error

[alexeykag]

Step 5/7 : ADD selenium-base-image/xvfb-chromium /usr/bin/xvfb-chromium
ADD failed: stat /var/lib/docker/tmp/docker-builder232117140/selenium-base-image/xvfb-chromium: no such file or directory

[AaronDButler]

To fix:
Find the following line in the selenium-base-image/Dockerfile:
ADD selenium-base-image/xvfb-chromium /usr/bin/xvfb-chromium
and replace with:
ADD xvfb-chromium /usr/bin/xvfb-chromium

The path needs to be relative to the Dockerfile.