Fix DB customization via envvar (#75)

Since 1.5 version, the DB host config default value changed from "localhost" to "127.0.0.1" [1], so the replacement performed here didn't work anymore.

[1] phpipam/phpipam@2fe6f9a

Author: Arderos

Dockerfile

@@ -63,7 +63,7 @@ RUN cp ${WEB_REPO}/config.dist.php ${WEB_REPO}/config.php && \
     chown www-data /var/www/html/app/subnets/import-subnet/upload && \
     chown www-data /var/www/html/css/images/logo && \
     echo "\$db['webhost'] = '%';" >> ${WEB_REPO}/config.php && \
-    sed -i -e "s/\['host'\] = 'localhost'/\['host'\] = getenv(\"MYSQL_ENV_MYSQL_HOST\") ?: \"mysql\"/" \
+    sed -i -e "s/\['host'\] = '127.0.0.1'/\['host'\] = getenv(\"MYSQL_ENV_MYSQL_HOST\") ?: \"mysql\"/" \
     -e "s/\['user'\] = 'phpipam'/\['user'\] = getenv(\"MYSQL_ENV_MYSQL_USER\") ?: \"root\"/" \
     -e "s/\['name'\] = 'phpipam'/\['name'\] = getenv(\"MYSQL_ENV_MYSQL_DB\") ?: \"phpipam\"/" \
     -e "s/\['pass'\] = 'phpipamadmin'/\['pass'\] = getenv(\"MYSQL_ENV_MYSQL_ROOT_PASSWORD\")/" \