Add /version endpoint

.github/workflows/build-and-deploy-rust.yml

@@ -45,6 +45,8 @@ jobs:
         run: |
           sleep 5
 
+          [[ $(curl -f -s http://localhost:8080/vss/version | xxd -p) == "0801" ]] || { echo "Version check failed"; exit 1; }
+
           # Put request with store='storeId' and key=k1
           hex=0A0773746F726549641A150A026B3110FFFFFFFFFFFFFFFFFF011A046B317631
           curl -f --data-binary "$(echo "$hex" | xxd -r -p)" http://localhost:8080/vss/putObjects

proto/vss.proto

@@ -3,6 +3,23 @@ package vss;
 option java_multiple_files = true;
 option java_package = "org.vss";
 
+// Server response on the `/version` endpoint.
+message VersionResponse {
+
+  // The API version supported by the server.
+  Version version = 1;
+}
+
+// Versions of the VSS API.
+enum Version {
+
+  // Default protobuf Enum value. Will not be used as `Version` by server.
+  VUNKNOWN = 0;
+
+  // The initial version of the VSS API.
+  V1 = 1;
+}
+
 // Request payload to be used for `GetObject` API call to server.
 message GetObjectRequest {