Add setup-sbt to workflow #138

	name: CI

	on: [push, workflow_dispatch]

	jobs:
	tests:
	runs-on: ubuntu-latest

	# The first two permissions are needed to interact with GitHub's OIDC Token endpoint.
	# The second set of three permissions are needed to write test results back to GH
	permissions:
	id-token: write
	contents: read
	issues: read
	checks: write
	pull-requests: write

	steps:
	- uses: actions/checkout@v2

	- uses: guardian/setup-scala@v1

	- name: Run tests
	run: sbt +test

	- name: Publish Unit Test Results
	uses: EnricoMi/publish-unit-test-result-action@v1
	if: always() #runs even if there is a test failure
	with:
	files: target/test-reports/*.xml

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