Moved radial host declaration to compose file

Moved where the radial host gets added to the hosts file to fix an error I was getting during the build. This is the same as what was in the Dockerfile but done at runtime.

Here's what's in /etc/hosts now in the workflow container:

root@ccecbde2db62:/code/services/workflow# cat /etc/hosts
127.0.0.1	localhost
::1	localhost ip6-localhost ip6-loopback
fe00::0	ip6-localnet
ff00::0	ip6-mcastprefix
ff02::1	ip6-allnodes
ff02::2	ip6-allrouters
10.64.1.77	radialhead.nrao.radial.local
172.26.0.10	ccecbde2db62