Fix implicit upgrade of composer to version 2

ratings/Dockerfile

@@ -1,16 +1,10 @@
-# Use composer to install dependencies
-FROM composer AS build
-
-COPY composer.json /app/
-
-RUN composer install
-
 #
 # Build the app
 #
 FROM php:7.4-apache
 
-RUN docker-php-ext-install pdo_mysql
+RUN apt-get update && apt-get install -yqq unzip libzip-dev \
+    && docker-php-ext-install pdo_mysql opcache zip
 
 # Enable AutoProfile for PHP which is currently opt-in beta
 RUN echo "instana.enable_auto_profile=1" > "/usr/local/etc/php/conf.d/zzz-instana-extras.ini"
@@ -22,11 +16,11 @@ RUN a2enmod rewrite && a2enmod status
 
 WORKDIR /var/www/html
 
-# copy dependencies from previous step
-COPY --from=build /app/vendor/ /var/www/html/vendor/
-
 COPY html/ /var/www/html
 
+COPY --from=composer /usr/bin/composer /usr/bin/composer
+RUN composer install
+
 # This is important. Symfony needs write permissions and we
 # dont know the context in which the container will run, i.e.
 # which user will be forced from the outside so better play

ratings/html/composer.json

@@ -1,17 +1,17 @@
 {
     "require": {
-        "php": "^7.3",
+        "php": "^7.4",
         "ext-curl": "*",
         "ext-json": "*",
         "ext-pdo": "*",
         "psr/log": "*",
         "monolog/monolog": "^1.24.0",
-        "symfony/config": "^5.0",
-        "symfony/http-kernel": "^5.0",
-        "symfony/http-foundation": "^5.0",
-        "symfony/routing": "^5.0",
-        "symfony/dependency-injection": "^5.0",
-        "symfony/framework-bundle": "^5.0",
+        "symfony/config": "^5.2",
+        "symfony/http-kernel": "^5.2",
+        "symfony/http-foundation": "^5.2",
+        "symfony/routing": "^5.2",
+        "symfony/dependency-injection": "^5.2",
+        "symfony/framework-bundle": "^5.2",
         "doctrine/annotations": "^1.10",
         "symfony/monolog-bundle": "^3.5",
         "instana/instana-php-sdk": "^1.10"