add deploy context (#4)

* * created bash script to build env file
* runs before docker-build in ./build
* entrypoint now exports these env vars if the file exists

* * entrypoint is now responsbile for merging build and deploy YAML files
for serverless to then export
* made get-env.sh more flexible

* use curly braces for safer var expansion in stirngs

* remove test command in get_env.sh

* create gitignore and ignore env file created at build time

* edits based on PR review

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