Don't start gluwa/hardhat-dev when testing against disconnected node

the creditcoin-node is isolated from the rest of the blockchain however
it is still configured to search for Ethereum transfers on Sepolia,
the same as Testnet! Running the hardhat container here is useless.

.github/workflows/runtime-upgrade.yml

@@ -470,10 +470,6 @@ jobs:
         run: |
           ./scripts/install-docker-engine-from-upstream.sh
 
-      - name: Start local Ethereum node
-        run: |
-          sudo docker run --name hardhat-dev --rm -p 8545:8545 -d gluwa/hardhat-dev
-
       - name: Install Node.js
         uses: actions/setup-node@v4
         with: