Use a custom OpenJDK base container image.

Change-Id: I9b24bdaf5f07974de12ae408df3b9a25e8268a48
diff --git a/src/main/resources/application.properties b/src/main/resources/application.properties
index 2c21fee..bd9db97 100644
--- a/src/main/resources/application.properties
+++ b/src/main/resources/application.properties
@@ -86,8 +86,7 @@
 quarkus.container-image.name = mulkcms2
 quarkus.container-image.registry = docker.benkard.de
 
-quarkus.jib.base-jvm-image = container-registry.oracle.com/java/openjdk:latest
-#quarkus.jib.jvm-arguments = -XX:+UseShenandoahGC,-XX:ShenandoahGCHeuristics=compact
+quarkus.jib.base-jvm-image = docker.benkard.de/mulk/openjdk-runtime:latest
 quarkus.jib.jvm-arguments = -XX:G1PeriodicGCInterval=300000,-XX:G1PeriodicGCSystemLoadThreshold=0
 
 quarkus.native.container-runtime = docker