Depends on your preferences but probably easiest approach is to take the -dev version of our PHP image and run a build from that to add whatever you need on top

Depends on your preferences but probably easiest approach is to take the -dev version of our PHP image and run a build from that to add whatever you need on top of that hardened base. You can even do a multi step build if you want to use the fully minimalistic image at runtime. Details at https://docs.minimus.io/foundations/going-distroless https://docs.minimus.io/foundations/going-distroless