Improve docker image

Change-Id: I4e0767497b019e70512e2c7962360f6b0a318658
diff --git a/Makefile b/Makefile
index 2cd1409..6606978 100644
--- a/Makefile
+++ b/Makefile
@@ -40,3 +40,6 @@
 
 fuzz:
 	go test -fuzz=FuzzTransformEndpoint -fuzztime=1m ./cmd/termmapper
+
+docker:
+	docker build -f Dockerfile -t korap/koralpipe-termmapper:latest .
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