feat: add Dockerfile and buildspec for offchain price pusher (#264) #632

Job	Run time
Build & Integration Tests / tests (pragma-sdk)	8m 29s
Build & Integration Tests / tests (vrf-listener)	8m 34s
Build & Integration Tests / tests (pragma-utils)	8m 13s
Build & Integration Tests / tests (checkpointer)	8m 21s
Run linters / lint	49s
Build Docker Image / build_containers (pragma-sdk)	51s
Build Docker Image / build_containers (price-pusher)	47s
Build Docker Image / build_containers (vrf-listener)	47s
Build & Integration Tests / tests (price-pusher)	8m 29s
Build Docker Image / build_containers (lmax-connector)	5m 29s
Build & Integration Tests / tests (lp-pricer)	8m 38s
Build Docker Image / build_containers (checkpointer)	40s
	1h 0m 7s

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