Reduce unit test time

Makefile

@@ -653,12 +653,9 @@ cover_profile:
 
 	$Q echo Running special test cases without race detector:
 	$Q go test ./cmd/server/cadence/
-	$Q echo Running package tests:
-	$Q for dir in $(PKG_TEST_DIRS); do \
-		mkdir -p $(BUILD)/"$$dir"; \
-		go test "$$dir" $(TEST_ARG) -coverprofile=$(BUILD)/"$$dir"/coverage.out || exit 1; \
-		(cat $(BUILD)/"$$dir"/coverage.out | grep -v "^mode: \w\+" >> $(UNIT_COVER_FILE)) || true; \
-	done;
+	$Q echo Running all tests with coverage:
+	$Q go test $(PKG_TEST_DIRS) $(TEST_ARG) -coverprofile=$(UNIT_COVER_FILE) || exit 1
+
 
 cover_integration_profile:
 	$Q mkdir -p $(BUILD)

docker/buildkite/Dockerfile

@@ -34,6 +34,11 @@ ENV V=0
 # allow git-status and similar to work
 RUN git config --global --add safe.directory /cadence
 
+COPY go.* ./
+COPY cmd/server/go.* ./cmd/server/
+COPY common/archiver/gcloud/go.* ./common/archiver/gcloud/
+RUN go mod download
+
 # https://github.com/docker-library/golang/blob/c1baf037d71331eb0b8d4c70cff4c29cf124c5e0/1.4/Dockerfile
 RUN mkdir -p /cadence
 WORKDIR /cadence