Centralize CI build JDK, update with Renovate (#660)

Author: JakeWharton

.github/renovate.json

@@ -0,0 +1,45 @@
+{
+  extends: [
+    "config:recommended"
+  ],
+  ignoreDeps: [
+    "com.jetbrains.intellij.platform",
+    "com.jetbrains.intellij.java",
+    "com.jetbrains.intellij.platform:lang-impl",
+    "com.jetbrains.intellij.platform:core-impl",
+    "com.jetbrains.intellij.platform:indexing",
+    "com.jetbrains.intellij.platform:analysis-impl",
+    "com.jetbrains.intellij.platform:project-model-impl"
+  ],
+  packageRules: [
+    {
+      matchUpdateTypes: [
+        "minor",
+        "patch",
+        "pin",
+        "digest"
+      ],
+      automerge: true
+    }
+  ],
+  ignorePresets: [
+    // Ensure we get the latest version and are not pinned to old versions.
+    'workarounds:javaLTSVersions',
+  ],
+  customManagers: [
+    // Update .java-version file with the latest JDK version.
+    {
+      customType: 'regex',
+      fileMatch: [
+        '\\.java-version$',
+      ],
+      matchStrings: [
+        '(?<currentValue>.*)\\n',
+      ],
+      datasourceTemplate: 'java-version',
+      depNameTemplate: 'java',
+      // Only write the major version.
+      extractVersionTemplate: '^(?<version>\\d+)',
+    },
+  ]
+}

.github/renovate.json5

@@ -0,0 +1 @@
+23

.github/workflows/.java-version

@@ -4,20 +4,17 @@ on: [push, pull_request]
 
 jobs:
   build:
-
     runs-on: ubuntu-latest
 
     steps:
     - uses: actions/checkout@v4
 
-    - name: Set up JDK 23
-      uses: actions/setup-java@v4
+    - uses: actions/setup-java@v4
       with:
         distribution: 'zulu'
-        java-version: 23
+        java-version-file: .github/workflows/.java-version
 
-    - name: Setup gradle
-      uses: gradle/actions/setup-gradle@v4
+    - uses: gradle/actions/setup-gradle@v4
 
     - name: Execute a build
       run: ./gradlew build :sample-plugin:buildPlugin --stacktrace

.github/workflows/PR.yml

@@ -7,20 +7,20 @@ on:
 
 jobs:
   build:
-
     runs-on: ubuntu-latest
 
     steps:
     - uses: actions/checkout@v4
-    - name: Set up JDK 23
-      uses: actions/setup-java@v4
+
+    - uses: actions/setup-java@v4
       with:
         distribution: 'zulu'
-        java-version: 23
+        java-version-file: .github/workflows/.java-version
+
+    - uses: gradle/actions/setup-gradle@v4
 
-    - name: Setup gradle
-      uses: gradle/actions/setup-gradle@v4
     - run: ./gradlew build --stacktrace
+
     - name: Publish a SNAPSHOT
       env:
         ORG_GRADLE_PROJECT_mavenCentralUsername: ${{ secrets.SONATYPE_USERNAME_APP_CASH }}