Always run CI on the latest Java (#1193)

Author: Goooler

.github/renovate.json5

@@ -31,13 +31,31 @@
       "allowedVersions": "!/(-alpha|-Alpha|-ALPHA|-beta|-Beta|-BETA|-milestone|-m|-SNAPSHOT)/"
     }
   ],
+  ignorePresets: [
+    // Ensure we get the latest version and are not pinned to old versions.
+    'workarounds:javaLTSVersions',
+  ],
   "customManagers": [
     {
       "customType": "regex",
       "fileMatch": ["\\.versions.toml$"],
       "matchStrings": ["(^|\n)(?<depName>gradle) *= *\"(?<currentValue>.*)\""],
       "depNameTemplate": "gradle",
       "datasourceTemplate": "gradle-version"
+    },
+    // Update .java-version file with the latest JDK version.
+    {
+      customType: 'regex',
+      managerFilePatterns: [
+        '/\\.java-version$/',
+      ],
+      matchStrings: [
+        '(?<currentValue>.*)\\n',
+      ],
+      datasourceTemplate: 'java-version',
+      depNameTemplate: 'java',
+      // Only write the major version.
+      extractVersionTemplate: '^(?<version>\\d+)',
     }
   ]
 }

.github/workflows/.java-version

@@ -0,0 +1 @@
+25

.github/workflows/build.yml

@@ -20,7 +20,7 @@ jobs:
         test_java_version:
           - 11 # Minimum supported version.
           - 17 # Supported by all tests.
-          - 25 # Latest supported version.
+          - latest # Latest supported version, the value syncs with the .java-version file.
         test_config_method: ["DSL", "PROPERTIES", "BASE"]
 
     steps:
@@ -31,7 +31,7 @@ jobs:
         uses: actions/setup-java@v5
         with:
           distribution: zulu
-          java-version: 25
+          java-version-file: .github/workflows/.java-version
 
       - name: Accept Android SDK license
         run: echo -e "24333f8a63b6825ea9c5514f83c2829b004d1fee\n" > "$ANDROID_HOME/licenses/android-sdk-license"

.github/workflows/publish-docs.yml

@@ -39,7 +39,7 @@ jobs:
         uses: actions/setup-java@v5
         with:
           distribution: zulu
-          java-version: 25
+          java-version-file: .github/workflows/.java-version
 
       - uses: gradle/actions/setup-gradle@v5
         with:

.github/workflows/publish-release.yml

@@ -21,7 +21,7 @@ jobs:
         uses: actions/setup-java@v5
         with:
           distribution: zulu
-          java-version: 25
+          java-version-file: .github/workflows/.java-version
 
       - name: Set version for tag
         run: |

.github/workflows/publish-snapshot.yml

@@ -27,7 +27,7 @@ jobs:
         uses: actions/setup-java@v5
         with:
           distribution: zulu
-          java-version: 25
+          java-version-file: .github/workflows/.java-version
 
       - name: Set version
         run: |

plugin/build.gradle.kts

@@ -138,9 +138,9 @@ val integrationTest by tasks.registering(Test::class) {
   classpath = integrationTestSourceSet.runtimeClasspath
 
   val testJavaVersion = providers.gradleProperty("testJavaVersion").orNull
-  if (testJavaVersion != null) {
+  if (testJavaVersion != null && testJavaVersion != "latest") {
     javaLauncher = javaToolchains.launcherFor {
-      languageVersion = JavaLanguageVersion.of(testJavaVersion.toInt())
+      languageVersion = JavaLanguageVersion.of(testJavaVersion)
     }
   }