qf: fix deploy script

deploy.sh

@@ -50,28 +50,28 @@ cd $SERVICE_PATH
 
 # Checkout the latest commit on GIT_BRANCH
 git fetch origin -v
-if [ $! -ne 0 ]; then
+if [ "$!" -ne 0 ]; then
   echo "Failed to fetch."
   exit 1
 fi
 git checkout origin/$GIT_BRANCH
-if [ $! -ne 0 ]; then
+if [ "$!" -ne 0 ]; then
   echo "Failed to checkout the latest commit."
   exit 1
 fi
 
 # Install the dependencies
 yarn install --frozen-lockfile --non-interactive --verbose
 
-if [ $! -ne 0 ]; then
+if [ "$!" -ne 0 ]; then
   echo "Failed to install the dependencies."
   exit 1
 fi
 
 # We use build:only here, because we don't want to run any checks beforehand. Those are handled by GH Actions.
-yarn build:only --verbose
+yarn build:only
 
-if [ $! -ne 0 ]; then
+if [ "$!" -ne 0 ]; then
   echo "Failed to build, this should be unreachable."
   echo "Ignoring this, since tsc transpiles everything regardless of errors."
   echo "This should have been caught by GH Actions."
@@ -80,7 +80,7 @@ fi
 if [ ! -z "$(screen -ls $SERVICE_NAME | grep $SERVICE_NAME)" ]; then
   echo "Service is already running, stopping it."
   screen -S $SERVICE_NAME -X quit
-  if [ $! -ne 0 ]; then
+  if [ "$!" -ne 0 ]; then
     echo "Failed to stop the service."
     exit 1
   fi
@@ -89,7 +89,7 @@ fi
 echo "Starting the service."
 screen -dmqS $SERVICE_NAME yarn start
 
-if [ $! -ne 0 ]; then
+if [ "$!" -ne 0 ]; then
   echo "Failed to start the service."
   exit 1
 fi