Update keytool commands and docker distribution flag to Debian Sid and Java 11

Dockerfile

@@ -2,31 +2,37 @@ ARG FROM_IMAGE=maven:3.5.3-jdk-8
 
 FROM ${FROM_IMAGE}
 
-ARG DOCKER_VERSION=5:19.03.0~3-0~debian-stretch
+ARG DEBIAN_DOCKER_VERSION=stretch
+ARG DOCKER_VERSION=5:19.03.0~3-0~debian-${DEBIAN_DOCKER_VERSION}
 ARG DOCKER_ARCH=amd64
 
 ENV CACERTS ${JAVA_HOME}/jre/lib/security/cacerts
 
-RUN apt-get update && \
+RUN apt -y autoremove && \
+    apt-get update && \
     apt-get upgrade -y && \
     apt-get install -y apt-transport-https ca-certificates \
 		            curl gnupg2 software-properties-common && \
     curl -fsSL https://download.docker.com/linux/debian/gpg  | apt-key add - 
+    
+# The Debian release can be obtained with lsb_release -cs
+# You can substitute $DEBIAN_VERSION by $(lsb_release -cs)
+# but Docker is not always available for latest Debians
 RUN add-apt-repository \
    "deb [arch=${DOCKER_ARCH}] https://download.docker.com/linux/debian \
-   $(lsb_release -cs) \
+   ${DEBIAN_DOCKER_VERSION} \
    stable"
 
-RUN apt-get update && echo "List of available Docker versions ( we are using ${DOCKER_VERSION} )" && apt-cache madison docker-ce
+RUN apt-get update && echo "List of available Docker versions ( we are using ${DOCKER_VERSION} )" && apt-cache madison docker-ce-cli
 
 RUN apt-get install -y docker-ce-cli=${DOCKER_VERSION}
 
-RUN curl   -o /tmp/cern-root-ca-2.crt "https://cafiles.cern.ch/cafiles/certificates/CERN%20Root%20Certification%20Authority%202.crt" && \
-      curl -o /tmp/cern-ca.crt        "https://cafiles.cern.ch/cafiles/certificates/CERN%20Certification%20Authority.crt" && \
-      curl -o /tmp/cern-ca-1.crt      "https://cafiles.cern.ch/cafiles/certificates/CERN%20Certification%20Authority(1).crt" && \
-      keytool -noprompt -import -keystore $JAVA_HOME/jre/lib/security/cacerts -storepass changeit -alias CERN_ROOT_CA_2 -file "/tmp/cern-root-ca-2.crt" && \
-      keytool -noprompt -import -keystore $JAVA_HOME/jre/lib/security/cacerts -storepass changeit -alias CERN_CA -file "/tmp/cern-ca.crt" && \
-      keytool -noprompt -import -keystore $JAVA_HOME/jre/lib/security/cacerts -storepass changeit -alias CERN_CA_1 -file "/tmp/cern-ca-1.crt" && \
+RUN   wget -O /tmp/cern-root-ca-2.crt "https://cafiles.cern.ch/cafiles/certificates/CERN%20Root%20Certification%20Authority%202.crt" && \
+      wget -O /tmp/cern-ca.crt        "https://cafiles.cern.ch/cafiles/certificates/CERN%20Certification%20Authority.crt" && \
+      wget -O /tmp/cern-ca-1.crt      "https://cafiles.cern.ch/cafiles/certificates/CERN%20Certification%20Authority(1).crt" && \
+      keytool -noprompt -import -cacerts -storepass changeit -alias CERN_ROOT_CA_2 -file "/tmp/cern-root-ca-2.crt" && \
+      keytool -noprompt -import -cacerts -storepass changeit -alias CERN_CA -file "/tmp/cern-ca.crt" && \
+      keytool -noprompt -import -cacerts -storepass changeit -alias CERN_CA_1 -file "/tmp/cern-ca-1.crt" && \
       rm /tmp/*.crt
 
 RUN mkdir -p /opt

pom.xml

@@ -55,6 +55,7 @@
 			<tag>${project.version}</tag>
 			<buildArgs>
 			  <FROM_IMAGE>maven:3.5.3-jdk-11</FROM_IMAGE>
+			  <DEBIAN_DOCKER_VERSION>stretch</DEBIAN_DOCKER_VERSION>
 			  <DOCKER_VERSION>5:19.03.0~3-0~debian-stretch</DOCKER_VERSION>
 			  <DOCKER_ARCH>amd64</DOCKER_ARCH>
 			</buildArgs>
@@ -62,4 +63,4 @@
       </plugin>
     </plugins>
   </build>
-</project>
\ No newline at end of file
+</project>