fly migrate-to-v2: Apps with volumes support 🎉

I wasn’t able to migrate a mini-app with volume:

ID                  	STATE  	NAME	SIZE	REGION	ZONE	ENCRYPTED	ATTACHED VM	CREATED AT
vol_jlgz1vpzl0e478m3	created	perm	10GB	ams   	8aba	true     	abc845a1   	1 year ago

Error: unfortunately the worker hosting your volume vol_jlgz1vpzl0e478m3 (perm) does not have capacity for another volume to support the migration; some other options: 1) try again later and there might be more space on the worker, 2) run a manual migration Manual migration to Apps V2, or 3) wait until we support volume migrations across workers (we’re working on it!)

Seems I’ll just have to wait before moving to v2?