Changed the Dockerfile so that there is a Inbucket user (and group). This will allow the container to be executed a the Inbucket user in stead of ROOT (security best practices)
If the user wants to use a different greeting.html file he can use the environment variable to define a different one. For now we just use the greeting.html from the defaults directory.
* Permissions for /start-inbucket.sh file
* Added timezone data so you can set the timezone in the image
* Updated Docker greeting.html file to include some basic instructions
* Updated to alpine 3.11
* Updated to golang 1.14
* Updated the required packages
- Install and remove OS and Go build deps in a single layer
- Use COPY instead of ADD
- WORKDIR now resolves ENV variables, use one
- Use VOLUMES for configuration and datastore
- Added launcher script start-inbucket.sh
- Made docker-run.sh more powerful
