add ps command to eliminate exception while running integration tests

images/php/7.3/Dockerfile

@@ -18,7 +18,8 @@ RUN apt-get update && apt-get install -y \
   lsof \
   default-mysql-client \
   vim \
-  zip
+  zip \
+  procps
 
 RUN docker-php-ext-configure \
   gd --with-freetype-dir=/usr/include/ --with-jpeg-dir=/usr/include/

images/php/7.4/Dockerfile

@@ -19,7 +19,8 @@ RUN apt-get update && apt-get install -y \
   lsof \
   default-mysql-client \
   vim \
-  zip
+  zip \
+  procps
 
 RUN docker-php-ext-configure gd --with-freetype --with-jpeg