improve Dockerfile

Author: palicao

Dockerfile

@@ -11,7 +11,7 @@ RUN pecl install redis && \
     pecl install xdebug && \
     docker-php-ext-enable redis xdebug
 
-RUN php -r "copy('https://getcomposer.org/installer', 'composer-setup.php');" && \
-    php -r "if (hash_file('sha384', 'composer-setup.php') === 'a5c698ffe4b8e849a443b120cd5ba38043260d5c4023dbf93e1558871f1f07f58274fc6f4c93bcfd858c6bd0775cd8d1') { echo 'Installer verified'; } else { echo 'Installer corrupt'; unlink('composer-setup.php'); } echo PHP_EOL;" && \
-    php composer-setup.php --install-dir /usr/bin --filename composer && \
-    php -r "unlink('composer-setup.php');"
+RUN wget https://github.com/composer/composer/releases/download/1.9.1/composer.phar -q &&\
+    mv composer.phar /usr/bin/composer && \
+    chmod +x /usr/bin/composer
+