need to use replace vs create (#1397)
need to use replace vs create (#1397)

to avoid failure as the app is already deployed
linsun/istio.github.io,ZackButcher/istio.github.io,geeknoid/istio.github.io,istio/istio.io,geeknoid/istio.github.io,istio/istio.io,ZackButcher/istio.github.io,ZackButcher/istio.github.io,geeknoid/istio.github.io,istio/istio.io,istio/istio.io,istio/istio.io,linsun/istio.github.io,ZackButcher/istio.github.io,linsun/istio.github.io,linsun/istio.github.io,istio/istio.io,geeknoid/istio.github.io,linsun/istio.github.io,istio/istio.io,geeknoid/istio.github.io