Swift: fix update-codeql

Also require sudo at the start of the script if updating.

.devcontainer/swift/update-codeql.sh

@@ -4,9 +4,15 @@ URL=https://github.com/github/codeql-cli-binaries/releases
 LATEST_VERSION=$(curl -L -s -H 'Accept: application/json' $URL/latest | sed -e 's/.*"tag_name":"\([^"]*\)".*/\1/')
 CURRENT_VERSION=v$(codeql version 2>/dev/null | sed -ne 's/.*release \([0-9.]*\)\./\1/p')
 if [[ $CURRENT_VERSION != $LATEST_VERSION ]]; then
-  curl -fSqL -o /tmp/codeql.zip $URL/download/$LATEST_VERSION/codeql-linux64.zip
-  unzip /tmp/codeql.zip -qd /opt
-  rm /tmp/codeql.zip
+  if [[ $UID != 0 ]]; then
+    echo "update required, please run this script with sudo:"
+    echo "  sudo $0"
+    exit 1
+  fi
+  ZIP=$(mktemp codeql.XXXX.zip)
+  curl -fSqL -o $ZIP $URL/download/$LATEST_VERSION/codeql-linux64.zip
+  unzip -q $ZIP -d /opt
+  rm $ZIP
   ln -sf /opt/codeql/codeql /usr/local/bin/codeql
   echo installed version $LATEST_VERSION
 else