enable gomod in Dockerfile & fix docker build bash

Signed-off-by: Nrunzexia <runzexia@yunify.com>

build/ks-apigateway/Dockerfile

@@ -10,7 +10,7 @@ FROM golang:1.12 as ks-apigateway-builder
 
 COPY / /go/src/kubesphere.io/kubesphere
 WORKDIR /go/src/kubesphere.io/kubesphere
-RUN CGO_ENABLED=0 GO111MODULE=off GOOS=linux GOARCH=amd64 go build -i -ldflags '-w -s' -o ks-apigateway cmd/ks-apigateway/apiserver.go && \
+RUN CGO_ENABLED=0 GO111MODULE=on GOOS=linux GOARCH=amd64 GOFLAGS=-mod=vendor go build -i -ldflags '-w -s' -o ks-apigateway cmd/ks-apigateway/apiserver.go && \
     go run tools/cmd/doc-gen/main.go --output=install/swagger-ui/api.json
 
 FROM alpine:3.9

build/ks-apiserver/Dockerfile

@@ -10,7 +10,7 @@ FROM golang:1.12 as ks-apiserver-builder
 COPY / /go/src/kubesphere.io/kubesphere
 
 WORKDIR /go/src/kubesphere.io/kubesphere
-RUN CGO_ENABLED=0 GO111MODULE=off GOOS=linux GOARCH=amd64 go build -i -ldflags '-w -s' -o ks-apiserver cmd/ks-apiserver/apiserver.go
+RUN CGO_ENABLED=0 GO111MODULE=on GOOS=linux GOARCH=amd64 GOFLAGS=-mod=vendor go build -i -ldflags '-w -s' -o ks-apiserver cmd/ks-apiserver/apiserver.go
 
 FROM alpine:3.9
 RUN apk add --update ca-certificates && update-ca-certificates

build/ks-controller-manager/Dockerfile

@@ -10,7 +10,7 @@ FROM golang:1.12 as controller-manager-builder
 COPY / /go/src/kubesphere.io/kubesphere
 WORKDIR /go/src/kubesphere.io/kubesphere
 
-RUN GOOS=linux GOARCH=amd64 CGO_ENABLED=0 go build --ldflags "-extldflags -static" -o controller-manager ./cmd/controller-manager/
+RUN CGO_ENABLED=0 GO111MODULE=on GOOS=linux GOARCH=amd64 GOFLAGS=-mod=vendor go build --ldflags "-extldflags -static" -o controller-manager ./cmd/controller-manager/
 
 FROM alpine:3.7
 RUN apk add --update ca-certificates && update-ca-certificates

build/ks-iam/Dockerfile

@@ -10,7 +10,7 @@ FROM golang:1.12 as ks-iam-builder
 COPY / /go/src/kubesphere.io/kubesphere
 
 WORKDIR /go/src/kubesphere.io/kubesphere
-RUN CGO_ENABLED=0 GO111MODULE=off GOOS=linux GOARCH=amd64 go build -i -ldflags '-w -s' -o ks-iam cmd/ks-iam/apiserver.go
+RUN CGO_ENABLED=0 GO111MODULE=on GOOS=linux GOARCH=amd64 GOFLAGS=-mod=vendor go build -i -ldflags '-w -s' -o ks-iam cmd/ks-iam/apiserver.go
 
 FROM alpine:3.9
 RUN apk add --update ca-certificates && update-ca-certificates

hack/docker_build.sh

@@ -7,9 +7,7 @@ REPO=kubespheredev
 TAG=latest
 
 # check if build was triggered by a travis cronjob
-if [[ ! -v TRAVIS_EVENT_TYPE ]]; then
-    echo "TRAVIS_EVENT_TYPE is not set, treat as regular build"
-elif [[ -z "$TRAVIS_EVENT_TYPE" ]]; then
+if [[ -z "$TRAVIS_EVENT_TYPE" ]]; then
     echo "TRAVIS_EVENT_TYPE is empty, also normaly build"
 elif [ $TRAVIS_EVENT_TYPE == "cron" ]; then
     TAG=dev-$(date +%Y%m%d)