Add Focal images for Nova SSH

Change-Id: I29c3b261ef984ded83ae7df2bd4a28b64984fbd0

nova-ssh/Dockerfile.ubuntu_focal

@@ -0,0 +1,17 @@
+ARG FROM=docker.io/ubuntu:focal
+FROM ${FROM}
+
+ARG UID=42424
+
+RUN set -ex && \
+    apt-get update && \
+    apt-get upgrade -y && \
+    apt-get install --no-install-recommends -y \
+      openssh-server \
+      openssh-client && \
+    rm -rf /var/lib/apt/lists/*
+
+RUN useradd -r -u ${UID} -d /var/lib/nova nova && \
+    chown -R nova: /etc/ssh && \
+    mkdir /var/run/sshd && \
+    chmod 0775 /var/run/sshd

zuul.d/nova-ssh.yaml

@@ -47,6 +47,12 @@
           tags:
             - latest-ubuntu_bionic
             - "ubuntu_bionic-{{ currentdate }}"
+        - context: nova-ssh
+          repository: openstackhelm/nova-ssh
+          dockerfile: Dockerfile.ubuntu_focal
+          tags:
+            - latest-ubuntu_focal
+            - "ubuntu_focal-{{ currentdate }}"
     files: &nova_ssh_files
       - nova-ssh/.*
       - zuul.d/nova-ssh.yaml