add tag to disable buf tests in CI

Author: andrewparmet

gradle/special-tests.gradle

@@ -3,7 +3,8 @@ apply plugin: 'com.adarshr.test-logger'
 def special = [
 	'Npm',
 	'Black',
-	'Clang'
+	'Clang',
+	'Buf'
 ]
 
 boolean isCiServer = System.getenv().containsKey("CI")

plugin-gradle/src/test/java/com/diffplug/gradle/spotless/BufIntegrationTest.java

@@ -17,8 +17,11 @@
 
 import java.io.IOException;
 
+import com.diffplug.spotless.tag.BufTest;
+
 import org.junit.jupiter.api.Test;
 
+@BufTest
 class BufIntegrationTest extends GradleIntegrationHarness {
 	@Test
 	void buf() throws IOException {

testlib/src/main/java/com/diffplug/spotless/tag/BufTest.java

@@ -0,0 +1,30 @@
+/*
+ * Copyright 2022 DiffPlug
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.diffplug.spotless.tag;
+
+import org.junit.jupiter.api.Tag;
+
+import java.lang.annotation.Retention;
+import java.lang.annotation.Target;
+
+import static java.lang.annotation.ElementType.METHOD;
+import static java.lang.annotation.ElementType.TYPE;
+import static java.lang.annotation.RetentionPolicy.RUNTIME;
+
+@Target({TYPE, METHOD})
+@Retention(RUNTIME)
+@Tag("Buf")
+public @interface BufTest {}

testlib/src/test/java/com/diffplug/spotless/protobuf/BufStepTest.java

@@ -17,10 +17,13 @@
 
 import java.io.File;
 
+import com.diffplug.spotless.tag.BufTest;
+
 import org.junit.jupiter.api.Test;
 
 import com.diffplug.spotless.StepHarnessWithFile;
 
+@BufTest
 class BufStepTest {
 	@Test
 	void test() throws Exception {