Specify distribution in setup-java action. Add Gradle Java toolchain.

Author: mattwelke

.github/workflows/publish.yml

@@ -9,10 +9,11 @@ jobs:
       contents: read
       packages: write 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - uses: actions/setup-java@v2
         with:
-          java-version: '18'
+          distribution: 'temurin'
+          java-version: '18'          
       - name: Validate Gradle wrapper
         uses: gradle/wrapper-validation-action@v1
       - name: Publish package

lib/build.gradle

@@ -10,6 +10,12 @@ repositories {
     mavenCentral()
 }
 
+java {
+    toolchain {
+        languageVersion = JavaLanguageVersion.of(17)
+    }
+}
+
 publishing {
     publications {
         mavenJava(MavenPublication) {