added some dockers for building jenkins agents

docker-jenkins/Dockerfile

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+FROM debian:latest
+
+COPY build-initial.sh /tmp
+RUN /tmp/build-initial.sh && rm -rf /tmp/*
+
+CMD ["/usr/sbin/sshd -D"]

docker-jenkins/Dockerfile.centos6

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+FROM centos:centos6
+
+COPY build-initial-centos6.sh /tmp
+RUN /tmp/build-initial-centos6.sh && rm -rf /tmp/*
+
+CMD ["/usr/sbin/sshd -D"]

docker-jenkins/Makefile

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+all:
+	@echo "Error: Specify the specific target."
+
+centos6-jenkins:
+	docker build -t centos6-jenkins -f Dockerfile.centos6 .
+
+debian-jenkins:
+	docker build -t debian-jenkins -f Dockerfile .

docker-jenkins/build-initial-centos6.sh

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+cd /tmp
+
+apt-get update &&
+yum install -y
+	openssh-server openssh-client openjdk-11-jdk openjdk-11-jre \
+	gcc gcc-c++ gcc-gnat gcc-java make autoconf automake libtool vim-enhanced &&
+useradd -m -s /bin/bash jenkins &&
+mkdir -p /var/run/sshd

docker-jenkins/build-initial.sh

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+cd /tmp
+
+apt-get update &&
+DEBIAN_FRONTEND=noninteractive apt-get install -y --no-install-recommends \
+	openssh-server openssh-client openjdk-11-jdk openjdk-11-jre \
+	gcc make autoconf automake libtool  vim &&
+useradd -m -s /bin/bash jenkins &&
+mkdir -p /var/run/sshd