Use new CircleCI convenience image for PHP

.circleci/config.yml

@@ -6,7 +6,7 @@ jobs:
   build:
     working_directory: ~/drupal-skeleton
     docker:
-      - image: circleci/php:7.3-node-browsers
+      - image: cimg/php:7.4-browsers
       - image: circleci/mysql:5.7-ram
         command: --max_allowed_packet=16M
         environment:
@@ -22,15 +22,11 @@ jobs:
     steps:
       - run:
           name: Install packages
-          command: sudo apt-get install -y libpng-dev default-mysql-client
-      - run:
-          name: Install PHP extensions
-          command: sudo docker-php-ext-install pdo_mysql gd
+          command: sudo apt-get update && sudo apt-get install -y default-mysql-client
       - run:
           name: Configure PHP
           command: |
-            echo "sendmail_path=/bin/true" | sudo tee -a "/usr/local/etc/php/php.ini"
-            echo "memory_limit=-1" | sudo tee -a "/usr/local/etc/php/php.ini"
+            echo "sendmail_path=/bin/true" | sudo tee -a "/etc/php.d/circleci.ini"
       - run:
           name: Create artifacts directory
           command: mkdir /tmp/artifacts
@@ -84,7 +80,7 @@ jobs:
 
       - run:
           name: Install the-build in the project
-          command: printf 'http://drupal-skeleton.local\nother\nn' | vendor/bin/the-build-installer
+          command: printf 'drupal-skeleton\nhttp://drupal-skeleton.local\npantheon\nn' | vendor/bin/the-build-installer
 
       - run:
           name: Wait for DB