CI: explicitly include defaults channel
This change is motivated by that of commit 814f4143ab7b0d083d4a8d2f2a29a07d7813400d
S
Scott C. Livingston committed
3079721ca96768df8aa5a3603499b48f5fc25cf3
Parent: 061749d
This change is motivated by that of commit 814f4143ab7b0d083d4a8d2f2a29a07d7813400d