Update Dockerfile

Author: adam-vessey

Dockerfile

@@ -91,7 +91,7 @@ apt-get install -y -o Dpkg::Options::="--force-confnew" --no-install-recommends
   php${PHP_VERSION}-memcached \
   libmemcached-tools \
   php${PHP_VERSION}-intl \
-  php${PHP_VERSION}-apcu
+  php${PHP_VERSION}-apcu \
   gh
 
 EOS