Fix container image building error

Dockerfile

@@ -1,14 +1,18 @@
-FROM golang:1.11.2-alpine as prod
+FROM golang:1.16-alpine as prod
 
 WORKDIR /go/src/github.com/cloud-barista/cb-webtool 
 COPY . .
 
-RUN apk update && apk add git
-RUN apk add --no-cache bash
-RUN go get -u -v github.com/go-session/echo-session
-RUN go get -u github.com/labstack/echo/... && go get github.com/cespare/reflex
-RUN go get -u github.com/davecgh/go-spew/spew
+#RUN apk update && apk add git
+#RUN apk add --no-cache bash
+RUN apk update
+RUN apk add --no-cache bash git gcc
 
+#RUN go get -u -v github.com/go-session/echo-session
+#RUN go get -u github.com/labstack/echo/...
+#RUN go get -u github.com/davecgh/go-spew/spew
+ENV GO111MODULE on
+RUN go get github.com/cespare/reflex
 
 EXPOSE 1234
 

go.mod

@@ -7,20 +7,12 @@ require (
 	github.com/foolin/echo-template v0.0.0-20190415034849-543a88245eec
 	github.com/go-session/echo-session v3.0.0+incompatible
 	github.com/go-session/session v3.1.2+incompatible // indirect
-	github.com/gopherjs/gopherjs v0.0.0-20210420193930-a4630ec28c79 // indirect
-	github.com/kr/text v0.2.0 // indirect
+	github.com/google/uuid v1.2.0
 	github.com/labstack/echo v3.3.10+incompatible
 	github.com/labstack/gommon v0.3.0 // indirect
-	github.com/mattn/go-colorable v0.1.8 // indirect
-	github.com/myesui/uuid v1.0.0 // indirect
-	github.com/smartystreets/assertions v1.2.0 // indirect
+	github.com/smartystreets/goconvey v1.6.4 // indirect
 	github.com/stretchr/testify v1.7.0 // indirect
-	github.com/twinj/uuid v1.0.0
 	github.com/valyala/fasttemplate v1.2.1 // indirect
 	golang.org/x/crypto v0.0.0-20210421170649-83a5a9bb288b
-	golang.org/x/net v0.0.0-20210421230115-4e50805a0758 // indirect
-	golang.org/x/sys v0.0.0-20210421221651-33663a62ff08 // indirect
-	gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c // indirect
-	gopkg.in/stretchr/testify.v1 v1.2.2 // indirect
-	gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b // indirect
+	golang.org/x/sys v0.0.0-20210423082822-04245dca01da // indirect
 )