Add the Polkadot Coretime runtime #2070

Job	Run time
Extract tasks from matrix	5s
check-migrations (polkadot, polkadot-runtime, relay/polkadot, wss://polkadot-try-runtime-node.par...	13m 37s
check-migrations (kusama, staging-kusama-runtime, relay/kusama, wss://kusama-try-runtime-node.par...	10m 34s
check-migrations (asset-hub-kusama, asset-hub-kusama-runtime, system-parachains/asset-hubs/asset-...	6m 47s
check-migrations (asset-hub-polkadot, asset-hub-polkadot-runtime, system-parachains/asset-hubs/as...	13m 37s
check-migrations (bridge-hub-kusama, bridge-hub-kusama-runtime, system-parachains/bridge-hubs/bri...	4m 59s
check-migrations (bridge-hub-polkadot, bridge-hub-polkadot-runtime, system-parachains/bridge-hubs...	6m 10s
check-migrations (collectives-polkadot, collectives-polkadot-runtime, system-parachains/collectiv...	5m 13s
check-migrations (coretime-kusama, coretime-kusama-runtime, system-parachains/coretime/coretime-k...	4m 50s
check-migrations (people-kusama, people-kusama-runtime, system-parachains/people/people-kusama, w...	4m 43s
check-migrations (people-polkadot, people-polkadot-runtime, system-parachains/people/people-polka...	4m 59s
check-migrations (encointer-kusama, encointer-kusama-runtime, system-parachains/encointer, wss://...	4m 47s
All migrations passed	1s
	1h 20m 22s

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