Add automation

protos/rail/v1/pis_schema.proto

@@ -0,0 +1,15 @@
+syntax = "proto3";
+
+package rail.v1;
+option go_package = "git.fjla.uk/owlboard/backend-data-contracts";
+
+message PisReferenceList {
+    repeated PisMapping entries = 1;
+}
+
+message PisMapping {
+    string code = 1;
+    string operator = 2;
+    repeated string stops = 3;
+    fixed64 stops_xxh4 = 4; // XXH4 Hash for fast lookup of exact match
+}