Add gnocchi-container Github Action

This action takes the Dockerfile from ci-tools
and updates it to run on Ubuntu 20.04

The action creates the container on each run but
after we have migrated away DockerHub to this Dockerfile
and archived ci-tools repo we can use the "container"
directive on workflows to pull the image from there
instead of building it on each run.

.github/actions/gnocchi-container/Dockerfile

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+FROM ubuntu:20.04
+ENV GNOCCHI_WORKSPACE /github/workspace
+ENV DEBIAN_FRONTEND noninteractive
+
+#NOTE(tobias-urdin): need gnupg for apt-key
+RUN apt-get update -y && apt-get install -qy gnupg
+RUN echo 'deb http://ppa.launchpad.net/deadsnakes/ppa/ubuntu focal main' >> /etc/apt/sources.list
+RUN apt-key adv --recv-keys --keyserver keyserver.ubuntu.com F23C5A6CF475977595C89F51BA6932366A755776
+RUN apt-get update -y && apt-get install -qy \
+        locales \
+        git \
+        wget \
+        curl \
+        nodejs \
+        npm \
+        python3 \
+        python3-dev \
+        python3-pip \
+        python3.6 \
+        python3.6-dev \
+# Needed for uwsgi core routing support
+        build-essential \
+        libffi-dev \
+        libpq-dev \
+        postgresql \
+        memcached \
+        mysql-client \
+        mysql-server \
+# For Ceph
+        librados-dev \
+        liberasurecode-dev \
+        python3-rados \
+        ceph \
+# For prometheus
+        libsnappy-dev \
+        libprotobuf-dev \
+# For redis
+        redis-server \
+        && rm -rf /var/lib/apt/lists/*
+
+#NOTE(sileht): really no utf-8 in 2017 !?
+ENV LANG en_US.UTF-8
+RUN update-locale
+RUN locale-gen $LANG
+
+#NOTE(sileht): Upgrade python dev tools
+RUN python3 -m pip install -U pip tox virtualenv
+RUN python3.6 -m pip install -U pip tox virtualenv
+
+RUN npm install [email protected] --global
+
+RUN groupadd --gid 1001 tester
+RUN useradd --uid 1001 --gid 1001 --home-dir $GNOCCHI_WORKSPACE --shell /bin/bash tester
+USER tester
+
+COPY entrypoint.sh /entrypoint.sh
+ENTRYPOINT ["/entrypoint.sh"]

.github/actions/gnocchi-container/action.yml

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+name: 'Gnocchi Container'
+description: 'Run command inside Gnocchi Container'
+author: 'Tobias Urdin'
+inputs:
+  command:
+    description: 'Command to run'
+    required: true
+runs:
+  using: 'docker'
+  image: 'Dockerfile'
+  args:
+    - ${{ inputs.command }}

.github/actions/gnocchi-container/entrypoint.sh

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+#!/bin/sh
+$@