Set PHP memory_limit to 128M, allow to override. (#16)

Make php.ini use the PHP_MEMORY_LIMIT env variable (with default value of 128M).

Author: naveenvalecha

Dockerfile

@@ -6,7 +6,8 @@ LABEL maintainer="marji@morpht.com"
 LABEL org.opencontainers.image.source="https://github.com/morpht/ci-php"
 
 ENV COMPOSER_VERSION=2.6.6 \
-  COMPOSER_HASH_SHA256=72600201c73c7c4b218f1c0511b36d8537963e36aafa244757f52309f885b314
+    COMPOSER_HASH_SHA256=72600201c73c7c4b218f1c0511b36d8537963e36aafa244757f52309f885b314 \
+    PHP_MEMORY_LIMIT=128M
 
 RUN apk add --no-cache --update git \
         bash \
@@ -20,7 +21,8 @@ RUN apk add --no-cache --update git \
     && rm -rf /var/cache/apk/* \
     && curl -L -o /usr/local/bin/composer https://github.com/composer/composer/releases/download/${COMPOSER_VERSION}/composer.phar \
     && echo "$COMPOSER_HASH_SHA256  /usr/local/bin/composer" | sha256sum -c \
-    && chmod +x /usr/local/bin/composer
+    && chmod +x /usr/local/bin/composer \
+    && echo 'memory_limit = ${PHP_MEMORY_LIMIT}' > /usr/local/etc/php/conf.d/memory-limit.ini
 
 RUN adduser -D -h /home/runner -u $RUNNER_UID runner