The assignment operator = suggests: We are going to initialize this variable Along with the expression following the = I bumped into this issue utilizing docker build. What's your docker Edition? Upgrading to the newest Edition helped me resolve the issue! Here is is some code I just wrote to https://www.tumblr.com/ongoingprojectsingurgaon/786479550721884160/discover-ground-level-grandeur-at-jms-low-rise?source=share