Use php7.0 for circleci

.circleci/config.yml

@@ -5,16 +5,22 @@ orbs:
   aws-cli: circleci/aws-cli@1.0.0
 jobs:
   install_composer_packages:
-    executor: php/default
+    docker:
+      - image: 'cimg/base:edge'
     steps:
       - checkout
+      - php/install-php:
+          version: '7.0'
       - php/install-composer
 
       - run:
           name: Install php extensions
           command: |
             sudo add-apt-repository ppa:ondrej/php
-            sudo apt install php7.4-imap
+            sudo apt update
+            sudo apt install php7.0-imap -y
+            sudo apt install php7.0-xml -y
+            sudo apt install zip unzip php7.0-zip php7.0-mbstring -y
 
       - php/install-packages:
           app-dir: server/