As per our previous announcement today sees the deprecation of the 32-bit ARM (armhf) version of our Unifi Controller image. The last functional armhf tag will be 7.1.66-ls151.
If you are currently running the Unifi Controller image on a 32 bit ARM platform we recommend you look at alternative options such as upgrading to a 64 bit OS if your hardware supports it.
latest or branch (develop, nightly, etc.) tags and will need to use a specific version tag if you still need access to the image. You can read more about this here.