Change base image for build process

Dockerfile

-FROM openjdk:8
+FROM  gradle:6.3-jdk8
 ADD . /
 WORKDIR /
-RUN ./gradlew -q --no-scan --no-daemon --no-build-cache distTar
+RUN gradle --no-daemon --no-scan --no-build-cache distTar
 RUN cd /build/distributions && tar xf app.tar
 
 FROM openjdk:8-jre-alpine

gradle/wrapper/gradle-wrapper.properties

 #Tue Apr 07 16:43:20 CEST 2020
-distributionUrl=https\://services.gradle.org/distributions/gradle-6.3-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.3-bin.zip
 distributionBase=GRADLE_USER_HOME
-distributionPath=wrapper/dists
+distributionPath=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME