Show if there are database errors

docker/php/Dockerfile

@@ -1,3 +1,13 @@
 FROM php:7.3-fpm
 
-RUN docker-php-ext-install mysqli pdo openssl mbstring tokenizer curl json gmp
+RUN docker-php-ext-install \
+    mysqli \
+    pdo \
+    openssl \
+    mbstring \
+    tokenizer \
+    curl \
+    json \
+    gmp
+
+RUN ln -sf /dev/stderr /var/log/fpm-error.log

docker/php/www.conf

@@ -10,3 +10,6 @@ pm.max_children = 5
 pm.start_servers = 2
 pm.min_spare_servers = 1
 pm.max_spare_servers = 3
+
+php_flag[display_errors] = on
+php_admin_flag[log_errors] = on