feat: add Datadog tracer to Dockerfiles #37

Job	Run time
unit-test	27s
integration-test-azure (AZURE)	4m 27s
integration-test-azure (AGNOSTIC)	3m 52s
integration-test-agnostic (AGNOSTIC)	3m 55s
integration-test-agnostic (AZURE)	4m 10s
push-image	-1s
	16m 50s

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