feature: add base image with documentation and licenses

Previously this lived in a mono repository. For the integration with GitHub Actions it now lives in a dedicated repository.

base/Dockerfile

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+FROM node:10-alpine
+
+LABEL name="Expo CLI for Docker"
+LABEL repository="https://github.com/bycedric/ci-expo"
+LABEL homepage="https://github.com/bycedric/ci-expo/tree/master/base"
+LABEL maintainer="Cedric van Putten <me+ci-expo@bycedric.com>"
+
+RUN apk add --no-cache bash git \
+	&& npm install --global expo-cli@2 \
+	&& npm cache rm --force \
+	&& rm -rf ~/.npm
+
+COPY LICENSE.md README.md THIRD_PARTY_NOTICE.md /
+COPY entrypoint.sh /entrypoint.sh
+
+ENTRYPOINT ["/entrypoint.sh"]
+CMD ["--help"]

base/LICENSE.md

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+# The MIT License (MIT)
+
+Copyright (c) 2018 Cedric van Putten <me@bycedric.com>
+
+> Permission is hereby granted, free of charge, to any person obtaining a copy
+> of this software and associated documentation files (the "Software"), to deal
+> in the Software without restriction, including without limitation the rights
+> to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+> copies of the Software, and to permit persons to whom the Software is
+> furnished to do so, subject to the following conditions:
+>
+> The above copyright notice and this permission notice shall be included in
+> all copies or substantial portions of the Software.
+>
+> THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+> IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+> FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+> AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+> LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+> OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+> THE SOFTWARE.

base/README.md

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+# Expo CLI for Docker
+
+A prebuilt docker image to use the [Expo CLI](https://docs.expo.io/versions/latest/workflow/expo-cli) on Docker-based environments.
+This image contains all necessary libraries to perform all commands of the CLI.
+
+- Based on `node:10-alpine` image
+- Contains globally installed `expo-cli@2`
+- Contains `bash` for [Metro bundler](https://facebook.github.io/metro/)
+- Contains `git` for NPM repository references
+
+## Usage
+
+The entry point of this image forwards to the Expo CLI itself.
+With this entry point you can provide any command directly to Docker.
+When nothing is provided, it will output the help information provided by the CLI.
+
+```bash
+$ docker run --rm bycedric/ci-expo
+$ docker run --rm bycedric/ci-expo pubish
+$ docker run --rm -ti bycedric/ci-expo login
+$ docker run --rm -ti --entrypoint sh bycedric/ci-expo
+```
+
+> This image is intended to use on Docker-based CI environments, see [the Expo CI guide](https://docs.expo.io/versions/latest/guides/setting-up-continuous-integration) to get started.
+
+## License
+
+The MIT License (MIT). Please see [License File](LICENSE.md) for more information.
+
+> This image is built on top of awesome open source libraries, see [third party licenses](THIRD_PARTY_NOTICE.md) for more information.
+
+--- ---
+
+<p align="center">
+    with :heart: <a href="https://bycedric.com" target="_blank">byCedric</a>
+</p>