fix: regression on merge conflict resolution

Author: erhhung

Dockerfile

@@ -109,6 +109,7 @@ WORKDIR /go/src/github.com/argoproj/argo-cd
 
 COPY go.* ./
 RUN mkdir -p gitops-engine
+COPY gitops-engine/go.* ./gitops-engine
 RUN go mod download
 
 # Perform the build