Support configuration via environment file

Change-Id: I9c6bc5a418fce8f4c4ed2984d913032dce3042ff
diff --git a/go.mod b/go.mod
index c17a7d8..bf53cc8 100644
--- a/go.mod
+++ b/go.mod
@@ -25,6 +25,7 @@
 	github.com/golang/protobuf v1.5.0 // indirect
 	github.com/golang/snappy v0.0.3 // indirect
 	github.com/google/flatbuffers v1.12.1 // indirect
+	github.com/joho/godotenv v1.4.0 // indirect
 	github.com/json-iterator/go v1.1.12 // indirect
 	github.com/klauspost/compress v1.12.3 // indirect
 	github.com/leodido/go-urn v1.2.1 // indirect