Add a github action for setting up test environment and running the tests #415

	name: Test extract-metadata action

	on:
	push:
	pull_request:
	branches: [main]

	jobs:
	test-extract-metadata:
	name: Retrieves metadata
	runs-on: ubuntu-20.04

	steps:
	- name: Check that environment is empty
	run: '[[ -z "$IMAGE_NAME" && -z "$COMMIT_ID" && -z "$BRANCH_NAME" ]]'

	- name: Call action to initialize environment
	uses: HSLdevcom/jore4-tools/github-actions/extract-metadata@extract-metadata-v1

	- name: Environment variables are set after action is called
	run: '[[ -n "$IMAGE_NAME" && -n "$COMMIT_ID" && -n "$BRANCH_NAME" ]]'

	- name: Check that IMAGE_NAME environment variable is created and is valid
	run: '[[ "$IMAGE_NAME" == "hsldevcom/jore4-tools" ]]'

	# (tests for BRANCH_NAME, CURRENT_DATE and COMMIT_ID are omitted for now as they might change on each run so its a little bit tricky to test those)

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