ci(feature): add env for proto location (#5700)

Description
Add OS env to override the location of ```proto``` file location.

Motivation and Context
Help with targeting different location for ```proto``` files.

How Has This Been Tested?
Tested locally and in docker image

What process can a PR reviewer use to test or verify this change?
---

<!-- Checklist -->
<!-- 1. Is the title of your PR in the form that would make nice release
notes? The title, excluding the conventional commit
tag, will be included exactly as is in the CHANGELOG, so please think
about it carefully. -->


Breaking Changes
---

- [x] None
- [ ] Requires data directory on base node to be deleted
- [ ] Requires hard fork
- [ ] Other - Please specify

<!-- Does this include a breaking change? If so, include this line as a
footer -->
<!-- BREAKING CHANGE: Description what the user should do, e.g. delete a
database, resync the chain -->

clients/nodejs/base_node_grpc_client/src/index.js

@@ -9,7 +9,7 @@ const path = require("path");
 const packageDefinition = protoLoader.loadSync(
   path.resolve(
     __dirname,
-    "../../../../applications/minotari_app_grpc/proto/base_node.proto"
+    process.env.BASE_NODE_PROTO || "../../../../applications/minotari_app_grpc/proto/base_node.proto"
   ),
   {
     keepCase: true,