re-activate auto-download of JDK with Gradle Toolchain support (#7)

Co-authored-by: Michael Hoennig <michael@hoennig.de>
Reviewed-on: #7
Reviewed-by: Timotheus Pokorra <timotheus.pokorra@hostsharing.net>

build.gradle

@@ -43,6 +43,8 @@ repositories {
 java {
     toolchain {
         languageVersion = JavaLanguageVersion.of(21)
+        vendor = JvmVendorSpec.ADOPTIUM
+        implementation = JvmImplementation.VENDOR_SPECIFIC
     }
 }
 

gradle.properties

@@ -1,3 +1,8 @@
+# Gradle Java Toolchain-support
+org.gradle.java.installations.auto-detect=true
+org.gradle.java.installations.auto-download=true
+# org.gradle.jvm.toolchain.install.adoptopenjdk.baseUri
+# org.gradle.java.installations.paths -- uncomment and set if needed
 
 # Spring BOM overrides
 # currently none necessary

settings.gradle

@@ -7,6 +7,10 @@ pluginManagement {
     }
 }
 
+plugins {
+    id 'org.gradle.toolchains.foojay-resolver-convention' version '0.7.0'
+}
+
 dependencyResolutionManagement {
     components {
         all {