fix: static build

Dockerfile

@@ -3,7 +3,7 @@ WORKDIR /usr/src/app
 COPY go.mod go.sum ./
 RUN go mod download && go mod verify
 COPY . .
-RUN make build \
+RUN CGO_ENABLED=0 make build \
  && mv bin/manager /manager_amd64 \
  && ln -s /manager_amd64 /manager
 ENTRYPOINT ["/manager"]