build: include '*.yml' files

src/main/kotlin/org.hiero.gradle.check.spotless-yaml.gradle.kts

@@ -3,7 +3,7 @@ plugins { id("com.diffplug.spotless") }
 
 spotless {
     format("actionYaml") {
-        target(".github/workflows/*.yaml")
+        target(".github/workflows/*.yaml", ".github/workflows/*.yml")
         /*
          * Prettier requires NodeJS and NPM installed; however, the NodeJS Gradle plugin and Spotless do not yet
          * integrate with each other. Currently there is an open issue report against spotless.

src/test/kotlin/org/hiero/gradle/test/ConventionPluginTest.kt

@@ -45,7 +45,7 @@ class ConventionPluginTest {
                     .listFiles()!!
                     .filter { it.isFile && it.name.endsWith(".gradle.kts") }
                     .map { it.name.substringBeforeLast(".gradle.kts") }
-            return pluginList.toTypedArray()
+            return pluginList.sorted().toTypedArray()
         }
     }
 }

src/test/kotlin/org/hiero/gradle/test/QualityGateTest.kt

@@ -0,0 +1,40 @@
+// SPDX-License-Identifier: Apache-2.0
+package org.hiero.gradle.test
+
+import org.assertj.core.api.Assertions.assertThat
+import org.gradle.testkit.runner.TaskOutcome
+import org.hiero.gradle.test.fixtures.GradleProject
+import org.junit.jupiter.api.Test
+
+class QualityGateTest {
+
+    @Test
+    fun `qualityGate formats yml and yaml files`() {
+        val p = GradleProject().withMinimalStructure()
+        val flow1 = p.file(".github/workflows/flow1.yml", "name: Flow 1    ")
+        val flow2 = p.file(".github/workflows/flow2.yaml", "name: Flow 2    ")
+        val txtFile = p.file(".github/workflows/temp.txt", "name: Flow 3    ")
+
+        val result = p.qualityGate()
+
+        assertThat(flow1)
+            .hasContent(
+                """
+            # SPDX-License-Identifier: Apache-2.0
+            name: Flow 1
+        """
+                    .trimIndent()
+            )
+        assertThat(flow2)
+            .hasContent(
+                """
+            # SPDX-License-Identifier: Apache-2.0
+            name: Flow 2
+        """
+                    .trimIndent()
+            )
+        assertThat(txtFile).hasContent("name: Flow 3    ") // unchanged
+
+        assertThat(result.task(":qualityGate")?.outcome).isEqualTo(TaskOutcome.SUCCESS)
+    }
+}

src/test/kotlin/org/hiero/gradle/test/fixtures/GradleProject.kt

@@ -109,6 +109,8 @@ class GradleProject {
 
     fun failQualityCheck(): BuildResult = runner(listOf("qualityCheck")).buildAndFail()
 
+    fun qualityGate(): BuildResult = runner(listOf("qualityGate")).build()
+
     private fun File.writeFormatted(content: String) {
         writeText("$expectedHeader$content\n")
     }