feat(core): Allow using a custom certificates in docker containers (#8705)

Co-authored-by: Jonathan Bennetts <jonathan.bennetts@gmail.com>

docker/images/n8n/docker-entrypoint.sh

@@ -1,4 +1,11 @@
 #!/bin/sh
+if [ -d /opt/custom-certificates ]; then
+  echo "Trusting custom certificates from /opt/custom-certificates."
+  export NODE_OPTIONS=--use-openssl-ca $NODE_OPTIONS
+  export SSL_CERT_DIR=/opt/custom-certificates
+  c_rehash /opt/custom-certificates
+fi
+
 if [ "$#" -gt 0 ]; then
   # Got started with arguments
   exec n8n "$@"