message: update ssh image to ubuntu LTS
diff: ARG UPSTREAM_REPO
  ARG UPSTREAM_TAG
  FROM ${UPSTREAM_REPO:-uselagoon}/commons:${UPSTREAM_TAG:-latest} as commons
  -FROM ubuntu:18.04
  +FROM ubuntu:20.04
  ARG LAGOON_VERSION
  ENV LAGOON_VERSION=$LAGOON_VERSION
  @@ -24,11 +24,14 @@ ENV TMPDIR=/tmp \
  # When Bash is invoked as non-interactive (like `bash -c command`) it sources a file that is given in `BASH_ENV`
  BASH_ENV=/home/.bashrc
  +ARG DEBIAN_FRONTEND=noninteractive
  +
  ENV LAGOON=ssh \
  OC_VERSION=v3.11.0 \
  OC_HASH=0cbc58b \
  OC_SHA256=4b0f07428ba854174c58d2e38287e5402964c9a9355f6c359d1242efd0990da3 \
  - KUBECTL_VERSION=v1.20.0
  + KUBECTL_VERSION=v1.20.0 \
  + TZ=UTC
  COPY services/ssh/libnss-mysql-1.5.tar.gz /tmp/libnss-mysql-1.5.tar.gz
  