Maven, Gradle: Build Docker image.

Change-Id: Ibf90cd31af67f847d67bd34fe1a8d73d49550088
diff --git a/gradle.properties b/gradle.properties
index d7dc937..f607976 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -1,3 +1,5 @@
+projectVersion = 0.1.0-SNAPSHOT
+
 quarkusPlatformGroupId = io.quarkus
 
 #quarkusPlatformArtifactId = quarkus-universe-bom
@@ -9,6 +11,7 @@
 #quarkusPlatformVersion = 999-SNAPSHOT
 #quarkusPluginVersion = 999-SNAPSHOT
 
+dockerPluginVersion = 6.1.3
 spotlessPluginVersion = 3.27.1
 versionsPluginVersion = 0.27.0
 useLatestVersionsPluginVersion = 0.2.13