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

…6618)

### Description of the change

Follows on from #6595, updates the proto service files according to
buf's lint, and generates the go client for use in the asset-syncer.

Note: I added a separate `buf.yaml` and `buf.gen.yaml` for the
oci-catalog service as buf doesn't let you refer to a proto outside of
the `buf.yaml` root, so the other option would have been to move our
existing `buf.yaml` and `buf.generate` into the Kubeapps root directory.
I don't mind either way, but it made more sense to me for the
oci-catalog service to have its own so that it is independent (it may be
useful outside of Kubeapps, theoretically).

### Benefits

The next PR can use the client without being cluttered by the extra
diff.

### Applicable issues

<!-- Enter any applicable Issues here (You can reference an issue using
#) -->

- ref: #6263

---------

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

Makefile

@@ -70,4 +70,13 @@ lint:
 	./script/linters/yaml-linter.sh
 	./script/linters/golang-linter.sh
 
-.PHONY: default all test-all test test-dashboard fmt vet lint install-tools
+buf-generate:
+	cd cmd/kubeapps-apis && buf generate
+	cd cmd/oci-catalog && buf generate
+	cd dashboard && yarn prettier
+
+buf-mod-update:
+	buf mod update cmd/kubeapps-apis
+	buf mod update cmd/oci-catalog
+
+.PHONY: default all buf-generate buf-mod-update test-all test test-dashboard fmt vet lint install-tools

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.lock

@@ -0,0 +1,2 @@
+# Generated by buf. DO NOT EDIT.
+version: v1

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"