Integrate with hosted-app-utils

Strip down this repo and allow the hosted-app-utils `package` script to
auto-generate the package.

README.md

@@ -2,12 +2,23 @@
 
 Packaging and installation tools for Streamline's "Streamline EMR" application.
 
-## Building
-1. ensure you have docker access to this project's container registry on GitLab
-2. run `package.sh` to generate a new application package
-3. package will be stored to `build-packages/`
+## Setup
+1. login to the gitlab docker registry: `docker login registry.gitlab.com`
+2. update submodules: `git submodule update --init`
 
-Several defaults can be overridden with command line options or by setting appropriate environment variables. A help prompt can be accessed using `package.sh -h`. For example, `package.sh -t latest -p linux/arm64` will build only the `linux/arm64` platform and use the `latest` tag instead of the current repo version.
+## Building
+To build, simply run `./package` to generate a new application package.
+
+The `package` script will assign a few variables by default, specifically:
+```
+CONFIG=${CONFIG:-${LOCATION}/config.json}
+COMPOSE=${COMPOSE:-${LOCATION}/docker-compose.yml}
+BUILD_DIR=${BUILD_DIR:-${LOCATION}/build-packages}
+```
+
+If necessary, each of these may be overridden by running with `VAR=VALUE ./package`.
+
+The `hosted-app-utils` project provides additional customization via command line arguments. This can be used to modify the package name, skip packaging of images, build for only one platform and more. For a list of options, run `./package -h`.
 
 ## Installing
 1. extract the generated archive file in a temporary folder on the target system