Ensure that the modules aren't being updated.

Author: bigkevmcd

Dockerfile

@@ -2,7 +2,7 @@ FROM openshift/origin-release:golang-1.15 AS build
 WORKDIR /go/src
 COPY . /go/src
 RUN GIT_COMMIT=$(git rev-parse HEAD) && \
-  CGO_ENABLED=0 GOOS=linux go build -a \
+  CGO_ENABLED=0 GOOS=linux go build -a -mod=readonly \
   -ldflags "-X github.com/redhat-developer/gitops-backend/pkg/health.GitRevision=${GIT_COMMIT}" ./cmd/backend-http
 
 FROM registry.access.redhat.com/ubi8/ubi-minimal

go.mod

@@ -1,6 +1,6 @@
 module github.com/redhat-developer/gitops-backend
 
-go 1.14
+go 1.15
 
 require (
 	github.com/emicklei/go-restful v2.12.0+incompatible // indirect