add network variable to github env variables

.github/workflows/postgres.yaml

@@ -32,6 +32,7 @@ jobs:
         run: python -m pytest tests/queries
         # Environment variables used by the `pg_client.py`
         env:
+          NETWORK: 'mainnet'
           POSTGRES_HOST: localhost
           POSTGRES_PORT: 5432
           DUNE_API_KEY: ${{ secrets.DUNE_API_KEY }}

.github/workflows/pull-request.yaml

@@ -27,5 +27,6 @@ jobs:
         run:
           python -m pytest tests/unit
         env:
+          NETWORK: 'mainnet'
           NODE_URL: https://rpc.ankr.com/eth
           PAYOUTS_SAFE_ADDRESS: '0x0000000000000000000000000000000000000000'