[occm] don't error on unsupported octavia provider (#1363)

Co-authored-by: Andrew Karpow <[email protected]>

Author: lingxiankong

.github/workflows/pr.yaml

@@ -1,6 +1,9 @@
 name: Lint Charts
 
-on: pull_request
+on:
+  pull_request:
+    branches:
+      - master
 
 jobs:
   lint:

docs/openstack-cloud-controller-manager/using-openstack-cloud-controller-manager.md

@@ -176,7 +176,7 @@ Although the openstack-cloud-controller-manager was initially implemented with N
   The load balancing algorithm used to create the load balancer pool. The value can be `ROUND_ROBIN`, `LEAST_CONNECTIONS`, or `SOURCE_IP`. Default: `ROUND_ROBIN`
 
 * `lb-provider`
-  Optional. Used to specify the provider of the load balancer, e.g. "amphora" or "octavia".
+  Optional. Used to specify the provider of the load balancer, e.g. "amphora" or "octavia". Only "amphora" or "octavia" provider are officially tested, other provider will cause a warning log.
 
 * `lb-version`
   Optional. If specified, only "v2" is supported.

pkg/cloudprovider/providers/openstack/openstack.go

@@ -416,7 +416,7 @@ func ReadConfig(config io.Reader) (Config, error) {
 	}
 
 	if !util.Contains(supportedLBProvider, cfg.LoadBalancer.LBProvider) {
-		return Config{}, fmt.Errorf("Unsupported LoadBalancer Provider: %s", cfg.LoadBalancer.LBProvider)
+		klog.Warningf("Unsupported LoadBalancer Provider: %s", cfg.LoadBalancer.LBProvider)
 	}
 
 	return cfg, err