feat: add release-related Dockerfiles

These two docker files are used to create deb and rpm packages which are later extracted and pushed to packagecloud.

[ci skip]

.dockerignore

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+*Dockerfile
+.dockerignore
+.git
+.vagrant
+contrib
+docs
+tests
+!contrib/dokku-installer.py

contrib/build-centos.Dockerfile

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+FROM ubuntu:14.04
+
+ENV DEBIAN_FRONTEND=noninteractive
+
+RUN apt-get update
+
+RUN apt-get -qq -y install gcc git build-essential wget ruby-dev ruby1.9.1 lintian rpm help2man man-db
+
+RUN command -v fpm > /dev/null || sudo gem install fpm --no-ri --no-rdoc
+
+WORKDIR /dokku
+
+COPY Makefile /dokku/
+
+COPY *.mk /dokku/
+
+RUN make deb-setup rpm-setup
+
+COPY . /dokku
+
+RUN make sshcommand plugn version copyfiles
+
+ARG DOKKU_VERSION=master
+ENV DOKKU_VERSION ${DOKKU_VERSION}
+
+ARG DOKKU_GIT_REV
+ENV DOKKU_GIT_REV ${DOKKU_GIT_REV}
+
+ARG IS_RELEASE=false
+ENV IS_RELEASE ${IS_RELEASE}
+
+RUN make rpm-herokuish rpm-dokku rpm-plugn rpm-sshcommand rpm-sigil
+
+RUN mkdir -p /data && cp /tmp/*.rpm /data && ls /data/

contrib/build-ubuntu.Dockerfile

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+FROM ubuntu:14.04
+
+ENV DEBIAN_FRONTEND=noninteractive
+
+RUN apt-get update
+
+RUN apt-get -qq -y install gcc git build-essential wget ruby-dev ruby1.9.1 lintian rpm help2man man-db
+
+RUN command -v fpm > /dev/null || sudo gem install fpm --no-ri --no-rdoc
+
+WORKDIR /dokku
+
+COPY Makefile /dokku/
+
+COPY *.mk /dokku/
+
+RUN make deb-setup rpm-setup
+
+COPY . /dokku
+
+RUN make sshcommand plugn version copyfiles
+
+ARG DOKKU_VERSION=master
+ENV DOKKU_VERSION ${DOKKU_VERSION}
+
+ARG DOKKU_GIT_REV
+ENV DOKKU_GIT_REV ${DOKKU_GIT_REV}
+
+ARG IS_RELEASE=false
+ENV IS_RELEASE ${IS_RELEASE}
+
+RUN make deb-herokuish deb-dokku deb-plugn deb-sshcommand deb-sigil
+
+RUN mkdir -p /data && cp /tmp/*.deb /data && ls /data/