add envvar to enable core dumps, disable xdebug tracing

app/startup.sh

@@ -104,6 +104,20 @@ fi
 # this was previously generated
 rm -f $DST_DIR/config.php.bak
 
+if [ ! -z "${TTRSS_CORE_DUMPS_ENABLED}" ]; then
+	apk add gdb
+
+	echo "don't forget to enable core dumps on the host:"
+	echo "echo '/tmp/core-%e.%p' > /proc/sys/kernel/core_pattern"
+	echo "then run gdb /usr/sbin/php-fpm81 /tmp/coredump-php-fpm-xyz"
+
+	# enable core dumps
+	sed -i.bak \
+	-e 's/;\(rlimit_core\) = .*/\1 = unlimited/' \
+	-e 's/; *\(process.dumpable\) = .*/\1 = yes/' \
+			/etc/php81/php-fpm.d/www.conf
+fi
+
 if [ ! -z "${TTRSS_XDEBUG_ENABLED}" ]; then
 	if [ -z "${TTRSS_XDEBUG_HOST}" ]; then
 		export TTRSS_XDEBUG_HOST=$(ip ro sh 0/0 | cut -d " " -f 3)
@@ -112,7 +126,7 @@ if [ ! -z "${TTRSS_XDEBUG_ENABLED}" ]; then
 	env | grep TTRSS_XDEBUG
 	cat > /etc/php81/conf.d/50_xdebug.ini <<EOF
 zend_extension=xdebug.so
-xdebug.mode=develop,trace,debug
+xdebug.mode=debug
 xdebug.start_with_request = yes
 xdebug.client_port = ${TTRSS_XDEBUG_PORT}
 xdebug.client_host = ${TTRSS_XDEBUG_HOST}