chore: make local docker build work on branch (#17896)
chore: make local docker build work on branch (#17896)

Branch does not pass `isDevelopmentMode` check because it does not have
a version ending with `-next`. Therefore, `env.PWTEST_DOCKER_BASE_IMAGE`
is ignored which leads to the pull of non-existent image.
microsoft/playwright,microsoft/playwright,microsoft/playwright,microsoft/playwright,microsoft/playwright,microsoft/playwright,microsoft/playwright,microsoft/playwright,microsoft/playwright