Add docker configurations

.gitignore

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+### MacOS
+
+.DS_Store

Dockerfile

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+FROM docker:stable
+
+COPY entrypoint.sh /entrypoint.sh
+RUN chmod +x /entrypoint.sh
+ENTRYPOINT ["/entrypoint.sh"]

README.md

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-# mysql-action
-GitHub Action to setup a MySQL database
+# MySQL GitHub Action
+
+This [GitHub Action](https://github.com/features/actions) sets up a MySQL database.
+
+## Usage
+
+```yaml
+steps:
+- uses: mirromutth/mysql-action@v1
+  with:
+    mysql password: ${{ secrets.databasePassword }} # Required, the password of the superuser for the specified database
+    mysql user: 'developer' # Optional, default value is "test", the superuser for the specified database. Of course you can use secrets, too
+    mysql version: '8.0' # Optional, default value is "latest", the version of the MySQL in Docker
+    mysql database: 'some_test' # Optional, default value is "test", the specified database which will be create
+```
+
+See [Docker Hub](https://hub.docker.com/_/mysql) for available versions.
+
+See [Creating and using secrets (encrypted variables)](https://help.github.com/en/articles/virtual-environments-for-github-actions#creating-and-using-secrets-encrypted-variables) for hiding database password.
+
+## License
+
+This project is released under the [MIT License](LICENSE).

action.yml

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+name: 'Setup MySQL'
+description: 'Setup a MySQL database'
+author: 'Mirro Mutth'
+branding:
+  icon: 'database'
+  color: 'orange'
+inputs:
+  # See https://hub.docker.com/_/mysql for supported versions and further details on input environment variables
+  mysql version:
+    description: 'Version of MySQL to use'
+    required: false
+    default: 'latest'
+  mysql database:
+    description: 'MYSQL_DATABASE - name for the default database that is created'
+    required: false
+    default: 'test'
+  mysql user:
+    description: 'MYSQL_USER - create the specified user with superuser power for created database'
+    required: false
+    default: 'test'
+  mysql password:
+    description: 'MYSQL_PASSWORD - superuser password'
+    required: true
+runs:
+  using: 'docker'
+  image: 'Dockerfile'

entrypoint.sh

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+#!/bin/sh
+
+docker_run="docker run -e MYSQL_RANDOM_ROOT_PASSWORD=true"
+docker_run="$docker_run -e MYSQL_DATABASE=$INPUT_MYSQL_DATABASE"
+docker_run="$docker_run -e MYSQL_USER=$INPUT_MYSQL_USER"
+docker_run="$docker_run -e MYSQL_PASSWORD=$INPUT_MYSQL_PASSWORD"
+docker_run="$docker_run -d -p 3306:3306 mysql:$INPUT_MYSQL_VERSION"
+
+sh -c "$docker_run"