🐛 simplify Dockerfile environment variable declarations #634

Job	Run time
Build & Integration Tests / tests (pragma-sdk)	8m 23s
Build & Integration Tests / tests (pragma-utils)	8m 25s
Build & Integration Tests / tests (vrf-listener)	8m 37s
Run linters / lint	51s
Build & Integration Tests / tests (price-pusher)	8m 26s
Build & Integration Tests / tests (checkpointer)	8m 51s
Build & Integration Tests / tests (lp-pricer)	8m 36s
Build Docker Image / build_containers (pragma-sdk)	1m 0s
Build Docker Image / build_containers (price-pusher)	39s
Build Docker Image / build_containers (vrf-listener)	44s
Build Docker Image / build_containers (lmax-connector)	5m 28s
Build Docker Image / build_containers (checkpointer)	47s
	1h 0m 47s

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