Introduce verify-local command to verify the local build setup required to release Spring Data.

Closes #50

src/main/java/org/springframework/data/release/build/BuildOperations.java

@@ -366,6 +366,17 @@ public class BuildOperations {
 		buildSystem.withJavaVersion(executor.detectJavaVersion(project)).verify();
 	}
 
+	/**
+	 * Verifies Maven staging authentication.
+	 */
+	public void verifyStagingAuthentication() {
+
+		Project project = Projects.BUILD;
+		BuildSystem buildSystem = buildSystems.getRequiredPluginFor(project);
+
+		buildSystem.withJavaVersion(executor.detectJavaVersion(project)).verifyStagingAuthentication();
+	}
+
 	/**
 	 * Selects the build system for the module contained in the given {@link ModuleIteration} and executes the given
 	 * function with it.

src/main/java/org/springframework/data/release/build/BuildSystem.java

@@ -116,6 +116,11 @@ interface BuildSystem extends Plugin<Project> {
 	 */
 	void verify();
 
+	/**
+	 * Verify general functionality and correctness of the build setup.
+	 */
+	void verifyStagingAuthentication();
+
 	/**
 	 * Prepare the build system with a Java version.
 	 *

src/main/java/org/springframework/data/release/build/MavenBuildSystem.java

@@ -550,6 +550,12 @@ class MavenBuildSystem implements BuildSystem {
 				.andIf(gpg.hasSecretKeyring(), () -> arg("gpg.secretKeyring").withValue(gpg.getSecretKeyring()));
 
 		mvn.execute(BUILD, arguments);
+	}
+
+	@Override
+	public void verifyStagingAuthentication() {
+
+		logger.log(BUILD, "Verifying Maven Staging Authentication…");
 
 		mvn.execute(BUILD, CommandLine.of(goal("nexus-staging:rc-list-profiles"), //
 				profile("central")));

src/main/java/org/springframework/data/release/cli/VerifyCommands.java

@@ -60,6 +60,7 @@ class VerifyCommands extends TimedCommand {
 		if (ObjectUtils.isEmpty(module) || "build".equals(module)) {
 			// Maven interaction
 			build.verify();
+			build.verifyStagingAuthentication();
 		}
 
 		if (ObjectUtils.isEmpty(module) || "deployment".equals(module)) {
@@ -80,4 +81,22 @@ class VerifyCommands extends TimedCommand {
 		logger.log("Verify", "All settings are verified. You can ship a release now.");
 	}
 
+	@CliCommand("verify-local")
+	public void verifyLocalReleaseTools() {
+
+		// Git checkout build
+		git.verify();
+
+		// Maven interaction
+		build.verify();
+
+		// GitHub verification
+		github.verifyAuthentication();
+
+		// Projects Service Verification
+		projectService.verifyAuthentication();
+
+		logger.log("Verify", "All local settings are verified. You can ship a release now.");
+	}
+
 }