Add build for debian buster image

We'll use debian buster for the python3 and jekyll images to avoid we
have to compile a current version of python 3 and ruby on our own.

Change-Id: Ic51afcc31b77ef908fd2b813887361aed0f1c98d
diff --git a/jenkins-docker/slave-debian/Dockerfile b/jenkins-docker/slave-debian/Dockerfile
index 7aa544c..f9f7974 100644
--- a/jenkins-docker/slave-debian/Dockerfile
+++ b/jenkins-docker/slave-debian/Dockerfile
@@ -17,7 +17,6 @@
     python-dev \
     python-pip \
     python-yaml \
-    python-jenkins \
     ant \
     autoconf \
     automake \
@@ -33,6 +32,8 @@
     build-essential \
     && rm -rf /var/lib/apt/lists/*
 
+RUN pip install python-jenkins
+
 ADD https://www.kernel.org/pub/software/scm/git/git-$GIT_VER.tar.gz /tmp/
 RUN tar xvfz /tmp/git-$GIT_VER.tar.gz && \
     cd git-$GIT_VER && \
diff --git a/jenkins-docker/slave-debian/Makefile b/jenkins-docker/slave-debian/Makefile
index 0fc3d7c..965d9a1 100644
--- a/jenkins-docker/slave-debian/Makefile
+++ b/jenkins-docker/slave-debian/Makefile
@@ -3,31 +3,32 @@
 MAVEN_VER=3.6.3
 GIT_VER=2.24.0
 
-build: build_stretch
+build: build_stretch build_buster
 
-publish: publish_stretch
+publish: publish_stretch publish_buster
 
-clean: clean_stretch
+clean: clean_stretch clean_buster
 
 build_stretch publish_stretch clean_stretch: DEBIAN_VER=stretch
+build_buster publish_buster clean_buster: DEBIAN_VER=buster
 
 publish_stretch: build_stretch
+publish_buster: build_buster
 
-build_stretch:  id_rsa.pub
+build_stretch build_buster:  id_rsa.pub
 	@echo "Building Docker for Debian:$(DEBIAN_VER)"
 	@echo "========================================"
 	cat Dockerfile | DEBIAN_VER=$(DEBIAN_VER) MAVEN_VER=$(MAVEN_VER) GIT_VER=$(GIT_VER) envsubst > Dockerfile-$(DEBIAN_VER)
 	docker build --no-cache=$(NO_CACHE) -f Dockerfile-$(DEBIAN_VER) -t ${IMAGE}:$(DEBIAN_VER) .
 
-publish_stretch:
+publish_stretch publish_buster:
 	docker push ${IMAGE}:$(DEBIAN_VER)
 
 id_rsa.pub: ../master/id_rsa.pub
 	cp $? $@
 
-clean_stretch:
+clean_stretch clean_buster:
 	docker rmi -f ${IMAGE}
 	-rm -f id_rsa*
 
 .PHONY: clean id_rsa.pub publish
-