Move around docker storage folders/config

resources/docker/php/Dockerfile

@@ -0,0 +1,15 @@
+FROM php:7.3-fpm-alpine
+
+#RUN apt-get update
+#RUN apt-get install -y libgmp-dev
+RUN apk add gmp-dev
+
+# Copy any config files in
+COPY ext-opcache.ini $PHP_INI_DIR/conf.d/
+
+RUN ln -sf /dev/stderr /var/log/fpm-error.log
+
+RUN docker-php-ext-install \
+  pdo_mysql \
+  gmp \
+  opcache