Cannot load Xdebug - it was already loaded (#2123)

zend_extension=xdebug.so is already in /etc/php/7.2/cli/conf.d/20-xdebug.ini

rediefing the alias causes the was already loaded notice.

also /var/www/vendor/bin/phpunit instead of ./vendor/bin/phpunit breaks the alias when vendor directory is not directly under the root app directory

workspace/Dockerfile

@@ -314,8 +314,7 @@ ARG INSTALL_XDEBUG=false
 RUN if [ ${INSTALL_XDEBUG} = true ]; then \
     # Load the xdebug extension only with phpunit commands
     apt-get install -y php${LARADOCK_PHP_VERSION}-xdebug && \
-    sed -i 's/^;//g' /etc/php/${LARADOCK_PHP_VERSION}/cli/conf.d/20-xdebug.ini && \
-    echo "alias phpunit='php -dzend_extension=xdebug.so /var/www/vendor/bin/phpunit'" >> ~/.bashrc \
+    sed -i 's/^;//g' /etc/php/${LARADOCK_PHP_VERSION}/cli/conf.d/20-xdebug.ini \
 ;fi
 
 # ADD for REMOTE debugging