Add ubuntu_xenial image build to Armada

All other Airship projects that use Ubuntu currently have a build
for Xenial, and until they all move to Bionic we should support
using the same version on all of them

This adds an ubuntu_xenial Dockerfile in addition to the ubuntu_bionic
Dockerfile, and updates the gates to add ubuntu_xenial jobs

Change-Id: I63753b02cb6d6ccc40cace9dd35b6e1ba67d1e31

.zuul.yaml

@@ -24,18 +24,21 @@
         - openstack-tox-pep8
         - armada-chart-build-gate
         - armada-chart-build-latest-htk
-        - armada-docker-build-gate-ubuntu
+        - armada-docker-build-gate-ubuntu_bionic
+        - armada-docker-build-gate-ubuntu_xenial
         - armada-docker-build-gate-opensuse
         - armada-airskiff-deploy
     gate:
       jobs:
         - openstack-tox-pep8
         - armada-chart-build-gate
-        - armada-docker-build-gate-ubuntu
+        - armada-docker-build-gate-ubuntu_bionic
+        - armada-docker-build-gate-ubuntu_xenial
         - armada-docker-build-gate-opensuse
     post:
       jobs:
-        - armada-docker-publish-ubuntu
+        - armada-docker-publish-ubuntu_bionic
+        - armada-docker-publish-ubuntu_xenial
         - armada-docker-publish-opensuse
         - armada-upload-git-mirror
 
@@ -65,7 +68,7 @@
       HTK_COMMIT: master
 
 - job:
-    name: armada-docker-build-gate-ubuntu
+    name: armada-docker-build-gate-ubuntu_bionic
     timeout: 1800
     run: tools/gate/playbooks/docker-image-build.yaml
     nodeset: armada-single-node
@@ -76,6 +79,18 @@
         dynamic:
           patch_set: true
 
+- job:
+    name: armada-docker-build-gate-ubuntu_xenial
+    timeout: 1800
+    run: tools/gate/playbooks/docker-image-build.yaml
+    nodeset: armada-single-node
+    vars:
+      publish: false
+      distro: ubuntu_xenial
+      tags:
+        dynamic:
+          patch_set: true
+
 - job:
     name: armada-docker-build-gate-opensuse
     timeout: 1800
@@ -116,7 +131,7 @@
       - ^swagger/.*$
 
 - job:
-    name: armada-docker-publish-ubuntu
+    name: armada-docker-publish-ubuntu_bionic
     timeout: 1800
     run: tools/gate/playbooks/docker-image-build.yaml
     nodeset: armada-single-node
@@ -132,6 +147,23 @@
         static:
           - latest
 
+- job:
+    name: armada-docker-publish-ubuntu_xenial
+    timeout: 1800
+    run: tools/gate/playbooks/docker-image-build.yaml
+    nodeset: armada-single-node
+    secrets:
+      - airship_armada_quay_creds
+    vars:
+      publish: true
+      distro: ubuntu_xenial
+      tags:
+        dynamic:
+          branch: true
+          commit: true
+        static:
+          - latest
+
 - job:
     name: armada-docker-publish-opensuse
     timeout: 1800

images/armada/Dockerfile.ubuntu_xenial

@@ -0,0 +1,80 @@
+ARG FROM=ubuntu:16.04
+FROM ${FROM}
+
+LABEL org.opencontainers.image.authors='airship-discuss@lists.airshipit.org, irc://#airshipit@freenode'
+LABEL org.opencontainers.image.url='https://airshipit.org'
+LABEL org.opencontainers.image.documentation='https://airship-armada.readthedocs.org'
+LABEL org.opencontainers.image.source='https://opendev.org/airship/armada'
+LABEL org.opencontainers.image.vendor='The Airship Authors'
+LABEL org.opencontainers.image.licenses='Apache-2.0'
+
+ENV DEBIAN_FRONTEND noninteractive
+ENV LANG=C.UTF-8
+ENV LC_ALL=C.UTF-8
+
+EXPOSE 8000
+
+RUN set -ex && \
+    apt-get -qq update && \
+    apt-get -y install \
+    ca-certificates \
+    curl \
+    netbase \
+    python3-dev \
+    python3-setuptools \
+    --no-install-recommends \
+    && apt-get autoremove -yqq --purge \
+    && apt-get clean \
+    && rm -rf \
+        /var/lib/apt/lists/* \
+        /tmp/* \
+        /var/tmp/* \
+        /usr/share/man \
+        /usr/share/doc \
+        /usr/share/doc-base
+
+WORKDIR /armada
+
+# Add armada user
+RUN useradd -u 1000 -g users -d $(pwd) armada
+
+ENTRYPOINT ["./entrypoint.sh"]
+CMD ["server"]
+
+COPY requirements.txt ./
+
+# Build
+RUN set -ex \
+    && buildDeps=' \
+      gcc \
+      libssl-dev \
+      make \
+      python3-pip \
+    ' \
+    && apt-get -qq update \
+    # Keep git separate so it's not removed below
+    && apt-get install -y $buildDeps git --no-install-recommends \
+    && python3 -m pip install -U pip \
+    && pip3 install -r requirements.txt --no-cache-dir \
+    && apt-get purge -y --auto-remove $buildDeps \
+    && apt-get autoremove -yqq --purge \
+    && apt-get clean \
+    && rm -rf \
+        /var/lib/apt/lists/* \
+        /tmp/* \
+        /var/tmp/* \
+        /usr/share/man \
+        /usr/share/doc \
+        /usr/share/doc-base
+
+COPY . ./
+
+# Setting the version explicitly for PBR
+ENV PBR_VERSION 0.8.0
+
+RUN \
+    mv etc/armada /etc/ && \
+    chown -R armada:users . && \
+    python3 setup.py install
+
+USER armada