Fix parsing of the preview.pipeline-arch-v2 flag (#2177)

Author: hariso

cmd/conduit/root/config/config_test.go

@@ -82,7 +82,7 @@ func TestConfigWithFlags(t *testing.T) {
 				"--pipelines.path", "/var/lib/conduit/pipelines",
 				"--preview.pipeline-arch-v2=true",
 				"--processors.path", "/opt/conduit/processors",
-				"--schema-registry.confluent.connection-string", "http://localhost:8081",
+				"--schema-registry.confluent.connection-string", "http://localhost:8888",
 				"--schema-registry.type", "confluent",
 				"--dev.blockprofile", "/tmp/block.prof",
 				"--dev.cpuprofile", "/tmp/cpu.prof",
@@ -106,8 +106,8 @@ func TestConfigWithFlags(t *testing.T) {
 				"pipelines.error-recovery.max-retries: 10",
 				"pipelines.error-recovery.max-retries-window: 15m0s",
 				"schema-registry.type: confluent",
-				"schema-registry.confluent.connection-string: http://localhost:8081",
-				"preview.pipeline-arch-v2: false",
+				"schema-registry.confluent.connection-string: http://localhost:8888",
+				"preview.pipeline-arch-v2: true",
 				"dev.cpuprofile: /tmp/cpu.prof",
 				"dev.memprofile: /tmp/mem.prof",
 				"dev.blockprofile: /tmp/block.prof",

pkg/conduit/config.go

@@ -119,7 +119,7 @@ type Config struct {
 
 	Preview struct {
 		// PipelineArchV2 enables the new pipeline architecture.
-		PipelineArchV2 bool `long:"preview.pipeline-arch-v2" usage:"enables experimental pipeline architecture v2 (note that the new architecture currently supports only 1 source and 1 destination per pipeline)"`
+		PipelineArchV2 bool `long:"preview.pipeline-arch-v2" mapstructure:"pipeline-arch-v2" usage:"enables experimental pipeline architecture v2 (note that the new architecture currently supports only 1 source and 1 destination per pipeline)"`
 	}
 
 	Dev struct {