Change scope of bootstrap registered Binder

Update `ConfigDataEnvironment` so that the `Binder` is registered as
a prototype bootstrap instance. This allows it to be accessed early
but still replaced when a more complete version is available.

Fixes gh-24559

Author: philwebb

spring-boot-project/spring-boot/src/main/java/org/springframework/boot/context/config/ConfigDataEnvironment.java

@@ -22,10 +22,12 @@
 import java.util.LinkedHashSet;
 import java.util.List;
 import java.util.Set;
+import java.util.function.Supplier;
 
 import org.apache.commons.logging.Log;
 
 import org.springframework.boot.BootstrapRegistry.InstanceSupplier;
+import org.springframework.boot.BootstrapRegistry.Scope;
 import org.springframework.boot.ConfigurableBootstrapContext;
 import org.springframework.boot.DefaultPropertiesPropertySource;
 import org.springframework.boot.context.config.ConfigDataEnvironmentContributors.BinderOption;
@@ -220,18 +222,21 @@ private ConfigDataEnvironmentContributor createInitialImportContributor(ConfigDa
 	void processAndApply() {
 		ConfigDataImporter importer = new ConfigDataImporter(this.logFactory, this.notFoundAction, this.resolvers,
 				this.loaders);
-		this.bootstrapContext.register(Binder.class, InstanceSupplier
-				.from(() -> this.contributors.getBinder(null, BinderOption.FAIL_ON_BIND_TO_INACTIVE_SOURCE)));
+		registerBootstrapBinder(() -> this.contributors.getBinder(null, BinderOption.FAIL_ON_BIND_TO_INACTIVE_SOURCE));
 		ConfigDataEnvironmentContributors contributors = processInitial(this.contributors, importer);
 		Binder initialBinder = contributors.getBinder(null, BinderOption.FAIL_ON_BIND_TO_INACTIVE_SOURCE);
-		this.bootstrapContext.register(Binder.class, InstanceSupplier.of(initialBinder));
+		registerBootstrapBinder(() -> initialBinder);
 		ConfigDataActivationContext activationContext = createActivationContext(initialBinder);
 		contributors = processWithoutProfiles(contributors, importer, activationContext);
 		activationContext = withProfiles(contributors, activationContext);
 		contributors = processWithProfiles(contributors, importer, activationContext);
 		applyToEnvironment(contributors, activationContext);
 	}
 
+	private void registerBootstrapBinder(Supplier<Binder> supplier) {
+		this.bootstrapContext.register(Binder.class, InstanceSupplier.from(supplier).withScope(Scope.PROTOTYPE));
+	}
+
 	private ConfigDataEnvironmentContributors processInitial(ConfigDataEnvironmentContributors contributors,
 			ConfigDataImporter importer) {
 		this.logger.trace("Processing initial config data environment contributors without activation context");

spring-boot-project/spring-boot/src/test/java/org/springframework/boot/context/config/TestConfigDataBootstrap.java

@@ -41,6 +41,7 @@ static class LocationResolver implements ConfigDataLocationResolver<Resource> {
 
 		@Override
 		public boolean isResolvable(ConfigDataLocationResolverContext context, ConfigDataLocation location) {
+			context.getBootstrapContext().get(Binder.class); // gh-24559
 			return location.hasPrefix("testbootstrap:");
 		}