chore(openapi): remove empty go.sum file

Author: henrybarreto

api/Dockerfile

@@ -11,7 +11,7 @@ COPY ./go.mod ./
 
 WORKDIR $GOPATH/src/github.com/shellhub-io/shellhub/openapi
 
-COPY ./openapi/go.mod ./openapi/go.sum ./
+COPY ./openapi/go.mod ./
 
 WORKDIR $GOPATH/src/github.com/shellhub-io/shellhub/api
 

openapi/Dockerfile

@@ -26,13 +26,15 @@ WORKDIR $GOPATH/src/github.com/shellhub-io/shellhub
 
 COPY ./go.mod ./
 
-COPY ./go.sum ./
+# As OpenAPI directory doens't depend on other modules in the repo, we don't need to copy go.sum.
+# COPY ./go.sum ./
 
 WORKDIR $GOPATH/src/github.com/shellhub-io/shellhub/openapi
 
 COPY ./openapi/go.mod ./
 
-COPY ./openapi/go.sum ./
+# As OpenAPI directory doens't depend on other modules in the repo, we don't need to copy go.sum.
+# COPY ./openapi/go.sum ./
 
 RUN go mod download