I use the minimal Photon distribution and it seems the system disk is only around 8GB.
That fills up quickly when installing some humongous Docker containers :/
List usage
df -h  | 
Check available space on disk
fdisk -l  | 
Install Diskpart
tdnf install parted
Diskpart
parted  | 
Increase size
resizepart  | 
print free  | 
Reboot
reboot  | 
Resize filesystem
resize2fs /dev/sda2  | 
df -h  | 
And a reboot just for good measure