[cherry-pick] Update repository config (#273) (#278)

/cherry-pick

Signed-off-by: 1gtm <1gtm@appscode.com>

Author: 1gtm

Makefile

@@ -78,7 +78,7 @@ TAG_DBG          := $(VERSION)-dbg_$(OS)_$(ARCH)
 
 GO_VERSION       ?= 1.15
 BUILD_IMAGE      ?= appscode/golang-dev:$(GO_VERSION)
-CHART_TEST_IMAGE ?= quay.io/helmpack/chart-testing:v3.0.0-rc.1
+CHART_TEST_IMAGE ?= quay.io/helmpack/chart-testing:v3.0.0
 
 OUTBIN = bin/$(OS)_$(ARCH)/$(BIN)
 ifeq ($(OS),windows)