[DEVOPS-638] buildkite: set NETWORK=mainnet
[DEVOPS-638] buildkite: set NETWORK=mainnet

input-output-hk/daedalus,input-output-hk/daedalus,input-output-hk/daedalus,input-output-hk/daedalus,input-output-hk/daedalus,input-output-hk/daedalus