Adds generated go client for oci-catalog that we'll use from syncer.

Signed-off-by: Michael Nelson <minelson@vmware.com>

cmd/oci-catalog/buf.gen.yaml

@@ -0,0 +1,14 @@
+# Copyright 2021-2023 the Kubeapps contributors.
+# SPDX-License-Identifier: Apache-2.0
+
+---
+version: v1beta1
+plugins:
+  - name: go
+    out: gen
+    opt:
+      - module=github.com/vmware-tanzu/kubeapps/cmd/oci-catalog/gen
+  - name: go-grpc
+    out: gen
+    opt:
+      - module=github.com/vmware-tanzu/kubeapps/cmd/oci-catalog/gen

cmd/oci-catalog/buf.yaml

@@ -0,0 +1,15 @@
+# Copyright 2023 the Kubeapps contributors.
+# SPDX-License-Identifier: Apache-2.0
+
+---
+version: v1beta1
+name: "buf.build/kubeapps/oci-catalog"
+build:
+  roots:
+    - proto
+lint:
+  use:
+    - DEFAULT
+  ignore_only:
+    RPC_RESPONSE_STANDARD_NAME:
+      - ocicatalog/v1alpha1/ocicatalog.proto

cmd/oci-catalog/build.rs

@@ -4,7 +4,7 @@
 use std::env;
 
 fn main() -> Result<(), Box<dyn std::error::Error>> {
-    tonic_build::compile_protos("proto/ocicatalog.proto")?;
+    tonic_build::compile_protos("proto/ocicatalog/v1alpha1/ocicatalog.proto")?;
 
     // If the binary is built with the ENV var "OCI_CATALOG_VERSION",
     // the value will be available at buildime. Otherwise, it becomes "devel"