Support octet-stream response from sonatype

See gh-21474

ci/images/releasescripts/src/main/java/io/spring/concourse/releasescripts/sonatype/SonatypeService.java

@@ -58,9 +58,9 @@ public class SonatypeService {
 	 */
 	public boolean artifactsPublished(ReleaseInfo releaseInfo) {
 		try {
-			ResponseEntity<Object> entity = this.restTemplate
+			ResponseEntity<?> entity = this.restTemplate
 					.getForEntity(String.format(SONATYPE_REPOSITORY_URI + "%s/spring-boot-%s.jar.sha1",
-							releaseInfo.getVersion(), releaseInfo.getVersion()), Object.class);
+							releaseInfo.getVersion(), releaseInfo.getVersion()), byte[].class);
 			if (HttpStatus.OK.equals(entity.getStatusCode())) {
 				logger.info("Already published to Sonatype.");
 				return true;

ci/images/releasescripts/src/test/java/io/spring/concourse/releasescripts/sonatype/SonatypeServiceTests.java

@@ -57,7 +57,8 @@ class SonatypeServiceTests {
 	void artifactsPublishedWhenPublishedShouldReturnTrue() {
 		this.server.expect(requestTo(String.format(
 				"https://oss.sonatype.org/service/local/repositories/releases/content/org/springframework/boot/spring-boot/%s/spring-boot-%s.jar.sha1",
-				"1.1.0.RELEASE", "1.1.0.RELEASE"))).andExpect(method(HttpMethod.GET)).andRespond(withSuccess());
+				"1.1.0.RELEASE", "1.1.0.RELEASE"))).andExpect(method(HttpMethod.GET))
+				.andRespond(withSuccess().body("ce8d8b6838ecceb68962b975b18682f4237ccf71".getBytes()));
 		boolean published = this.service.artifactsPublished(getReleaseInfo());
 		assertThat(published).isTrue();
 		this.server.verify();

ci/scripts/sync-to-maven-central.sh

@@ -2,7 +2,7 @@
 
 export BUILD_INFO_LOCATION=$(pwd)/artifactory-repo/build-info.json
 version=$( cat artifactory-repo/build-info.json | jq -r '.buildInfo.modules[0].id' | sed 's/.*:.*:\(.*\)/\1/' )
-java -jar /spring-boot-release-scripts.jar syncToCentral "RELEASE" $BUILD_INFO_LOCATION > /dev/null || { exit 1; }
+java -jar /spring-boot-release-scripts.jar syncToCentral "RELEASE" $BUILD_INFO_LOCATION || { exit 1; }
 
 echo "Sync complete"
 echo $version > version/version