Initial commit.

.dockerignore

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+Dockerfile*
+.dockerignore
+
+docker-compose*
+
+.git*

Dockerfile

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+#FROM openjdk:8-jre-alpine
+FROM alpine:edge
+
+RUN apk add --no-cache openjdk8-jre-base docker openssl openssh tar gzip xz bzip2
+
+ADD container-init.sh /usr/local/bin/init
+
+ENTRYPOINT [ "init" ]
+EXPOSE 22
+

Dockerfile.armhf

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+FROM container4armhf/armhf-alpine:edge
+
+RUN echo "http://nl.alpinelinux.org/alpine/edge/community" >> /etc/apk/repositories
+
+RUN apk add --no-cache openjdk8-jre-base docker openssl openssh tar gzip xz bzip2 &&\
+	update-ca-certificates
+
+ADD container-init.sh /usr/local/bin/init
+
+ENTRYPOINT [ "init" ]
+EXPOSE 22
+

container-init.sh

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+#!/bin/sh -e
+
+mkdir -p ~root/.ssh
+chmod 700 ~root/.ssh
+
+if [ -f "/authorized_keys" ]; then
+	# use mounted-in authorized_keys
+	cp -v /authorized_keys ~root/.ssh/authorized_keys
+	chmod 600 ~root/.ssh/authorized_keys
+elif [ ! -z "$1" ]; then
+	# download authorized_keys from http server
+	wget -q -O ~root/.ssh/authorized_keys "$1"
+	chmod 600 ~root/.ssh/authorized_keys
+	shift 1
+fi
+
+# generate host keys if they don't exist yet
+ssh-keygen -A
+
+# start ssh server
+exec "$(which sshd)" -D -e -p 22 "$@"

docker-compose.yml

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+version: "2"
+
+services:
+  daemon-armhf:
+    restart: always
+    build:
+      context: .
+      dockerfile: Dockerfile.armhf
+    ports:
+      - "2222:22"
+    volumes:
+      - /tmp/:/tmp/
+      - /var/run/docker.sock:/var/run/docker.sock
+      - /var/tmp/jenkins-slave:/var/tmp/jenkins-slave
+      #- ./authorized_keys:/authorized_keys:ro
+    #command:
+    #  - http://url.to/your/authorized_keys
+  daemon:
+    restart: always
+    build:
+      context: .
+    ports:
+      - "2222:22"
+    volumes:
+      - /tmp/:/tmp/
+      - /var/run/docker.sock:/var/run/docker.sock
+      - /var/tmp/jenkins-slave:/var/tmp/jenkins-slave
+      #- ./authorized_keys:/authorized_keys:ro
+    #command:
+    #  - http://url.to/your/authorized_keys