- moved to an all Alpine stack for build and the final image;
- now two Dockerfiles:
  - `Dockerfile` builds a tag by cloning the GitHub repo;
  - `Dockerfile_dev` builds a copy of the local project;
- added templated versions of both the above that are so that they are updated automatically as part of the Maven build; and
- updated the main `pom.xml` with a `resource` plugin to copy the `Dockerfile` and `Dockerfile_dev` to the base directory.

- added Dockerfile_installer which uses the JHOVE installer for a faster and more reliable way of building containers.