memory / disk requirements not documented

[dirkpetersen]

a 1.7GB machine / Azure A1 instance is out of memory

root@c-demo:/gen3/git/compose-services# docker logs revproxy-service
fatal error: runtime: out of memory

runtime stack:
runtime.throw(0x5579c60b98fc, 0x16)
	/usr/local/go/src/runtime/panic.go:617 +0x74 fp=0x7ffd24123c00 sp=0x7ffd24123bd0 pc=0x5579c4ad6aa4

memory no more

root@c-demo:/gen3/git/compose-services# free -h
              total        used        free      shared  buff/cache   available
Mem:           1.6G        1.4G         80M         25M        121M         21M
Swap:            0B          0B          0B

the disk should have at least 30G

df -h
Filesystem      Size  Used Avail Use% Mounted on
udev            814M     0  814M   0% /dev
tmpfs           166M  676K  165M   1% /run
/dev/sda1        29G   19G   11G  63% /