Use race condition detection on sytest runs

.circleci/config.yml

@@ -10,7 +10,7 @@ jobs:
       # Set up dendrite
       - run: 
           name: Build Dendrite
-          command: ./build.sh
+          command: ./build.sh -r
       - run: 
           name: Copy dummy keys to root
           command: |

build.sh

@@ -1,3 +1,25 @@
 #!/bin/sh
 
-GOBIN=$PWD/`dirname $0`/bin go install -v ./cmd/...
+ARGS="-v ./cmd/..."
+
+usage() {
+  echo "Usage: $0 [-r]" 1>&2
+  echo
+  echo "-r"
+  echo "  Build with race condition detection"
+  exit 1
+}
+
+while getopts ":r" o; do
+    case "${o}" in
+        r)
+            # Turn on race condition detection
+            ARGS="-race $ARGS"
+            ;;
+        *)
+            usage
+            ;;
+    esac
+done
+
+GOBIN=$PWD/`dirname $0`/bin go install $ARGS