Update Go, use go tool covdata for coverage files?

build/scripts/complement-cmd.sh

@@ -2,14 +2,15 @@
 
 # This script is intended to be used inside a docker container for Complement
 
+export GOCOVERDIR=/tmp/covdatafiles
+mkdir -p "${GOCOVERDIR}"
 if [[ "${COVER}" -eq 1 ]]; then
   echo "Running with coverage"
   exec /dendrite/dendrite-cover \
     --really-enable-open-registration \
     --tls-cert server.crt \
     --tls-key server.key \
-    --config dendrite.yaml \
-    --test.coverprofile=complementcover.log
+    --config dendrite.yaml
 else
   echo "Not running with coverage"
   exec /dendrite/dendrite \