tools: fix building golangci-lint on Arm64

If CGO is enabled, Go tries to use the gold linker (-fuse-ld=gold), which is
not installed. CGO was disabled, because it is not needed for golangci-lint.

tools/Dockerfile

@@ -10,8 +10,8 @@ RUN cd /tmp \
   && mkdir -p /tmp/build/.cache \
   && mkdir -p /tmp/build/.modcache \
   && cd /tmp/tools \
-  && go install -trimpath github.com/golangci/golangci-lint/cmd/golangci-lint \
-  && golangci-lint custom \
+  && CGO_ENABLED=0 go install -trimpath github.com/golangci/golangci-lint/cmd/golangci-lint \
+  && CGO_ENABLED=0 golangci-lint custom \
   && mv ./custom-gcl /usr/local/bin/custom-gcl \
   && chmod -R 777 /tmp/build/ \
   && git config --global --add safe.directory /build