Define dockerfile instructions set centrally. #327

Job	Run time
build	6m 56s
test-sensor-e2e (ubuntu-latest)	33m 56s
test-full-e2e (ubuntu-latest, compose)	33s
test-full-e2e (ubuntu-latest, distroless)	34s
test-full-e2e (ubuntu-latest, dotnet)	34s
test-full-e2e (ubuntu-latest, elixir)	8s
test-full-e2e (ubuntu-latest, golang)	22s
test-full-e2e (ubuntu-latest, haskell)	33s
test-full-e2e (ubuntu-latest, http-probe)	34s
test-full-e2e (ubuntu-latest, image-edit)	33s
test-full-e2e (ubuntu-latest, java)	32s
test-full-e2e (ubuntu-latest, node)	33s
test-full-e2e (ubuntu-latest, php)	33s
test-full-e2e (ubuntu-latest, python)	34s
test-full-e2e (ubuntu-latest, ruby)	17s
test-full-e2e (ubuntu-latest, rust)	9s
	47m 21s

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