[cherry-pick] Update repository config (#131) (#133)

/cherry-pick

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

Author: 1gtm

.github/workflows/ci.yml

@@ -13,10 +13,10 @@ jobs:
     name: Build
     runs-on: ubuntu-latest
     steps:
-      - name: Set up Go 1.14
+      - name: Set up Go 1.15
         uses: actions/setup-go@v1
         with:
-          go-version: 1.14
+          go-version: 1.15
         id: go
 
       - uses: actions/checkout@v1

Makefile

@@ -76,7 +76,7 @@ TAG              := $(VERSION)_$(OS)_$(ARCH)
 TAG_PROD         := $(TAG)
 TAG_DBG          := $(VERSION)-dbg_$(OS)_$(ARCH)
 
-GO_VERSION       ?= 1.14
+GO_VERSION       ?= 1.15
 BUILD_IMAGE      ?= appscode/golang-dev:$(GO_VERSION)
 CHART_TEST_IMAGE ?= quay.io/helmpack/chart-testing:v3.0.0-rc.1