gRPC - register additional bean archives

- an application archive that contains a MutinyBean implementor is an
additional bean archive
- resolves quarkusio#19864

(cherry picked from commit 13bc4d2)

extensions/grpc/deployment/src/main/java/io/quarkus/grpc/deployment/GrpcServerProcessor.java

@@ -28,12 +28,14 @@
 import io.grpc.internal.ServerImpl;
 import io.quarkus.arc.deployment.AdditionalBeanBuildItem;
 import io.quarkus.arc.deployment.AnnotationsTransformerBuildItem;
+import io.quarkus.arc.deployment.BeanArchivePredicateBuildItem;
 import io.quarkus.arc.deployment.CustomScopeAnnotationsBuildItem;
 import io.quarkus.arc.deployment.SyntheticBeansRuntimeInitBuildItem;
 import io.quarkus.arc.deployment.ValidationPhaseBuildItem;
 import io.quarkus.arc.processor.AnnotationsTransformer;
 import io.quarkus.arc.processor.BeanInfo;
 import io.quarkus.arc.processor.BuiltinScope;
+import io.quarkus.deployment.ApplicationArchive;
 import io.quarkus.deployment.IsDevelopment;
 import io.quarkus.deployment.IsNormal;
 import io.quarkus.deployment.annotations.BuildProducer;
@@ -218,7 +220,7 @@ private Set<MethodInfo> gatherBlockingMethods(ClassInfo service) {
     AnnotationsTransformerBuildItem transformUserDefinedServices(CombinedIndexBuildItem combinedIndexBuildItem,
             CustomScopeAnnotationsBuildItem customScopes) {
         // User-defined services usually only declare the @GrpcService qualifier
-        // We need to add @GrpcEnableRequestContext and @Singleton if needed 
+        // We need to add @GrpcEnableRequestContext and @Singleton if needed
         Set<DotName> userDefinedServices = new HashSet<>();
         for (AnnotationInstance annotation : combinedIndexBuildItem.getIndex().getAnnotations(GrpcDotNames.GRPC_SERVICE)) {
             if (annotation.target().kind() == Kind.CLASS) {
@@ -393,4 +395,16 @@ void configureMetrics(GrpcBuildTimeConfig configuration, Optional<MetricsCapabil
         }
     }
 
+    @BuildStep
+    BeanArchivePredicateBuildItem additionalBeanArchives() {
+        return new BeanArchivePredicateBuildItem(new Predicate<ApplicationArchive>() {
+
+            @Override
+            public boolean test(ApplicationArchive archive) {
+                // Every archive that contains a generated implementor of MutinyBean is considered a bean archive
+                return !archive.getIndex().getKnownDirectImplementors(GrpcDotNames.MUTINY_BEAN).isEmpty();
+            }
+        });
+    }
+
 }