remove modcache

Dockerfile

@@ -34,8 +34,6 @@ RUN rm -rf /usr/local/go && \
     tar -C /usr/local -xzf go*.linux-$(uname -m).tar.gz && \
     echo 'export PATH=$PATH:/usr/local/go/bin' >> /etc/profile
 
-RUN mkdir -p "$(go env GOMODCACHE)" && cd $(go env GOMODCACHE) && tar xvf /tmp/modcache.tar && rm /tmp/modcache.tar && cd /tmp
-
 RUN \
     go install -v google.golang.org/protobuf/cmd/protoc-gen-go@v1.28.1 && \
     go install -v github.com/golangci/golangci-lint/cmd/golangci-lint@v1.50.1 && \