Getting this error, at random moments, when users are loading the site and then the docker instance crashes.
"Fontconfig error: Cannot load default config file: No such file: (null)"

Running the installs for fonts fixes it, but not sure why I am getting this error, on a new deployment.

apk add --no-cache
fontconfig
ttf-dejavu
ttf-droid
ttf-liberation
ttf-freefont

Everything is pretty standard and all works, running 5 other Ghost CMS sites, 1 using docker and 4 using CLI.
Neither of those sites have any issues, so I am bit stomped by this.