[DPE-2921] Add trivy security scanning pipeline #8

	name: trivy
	on:
	pull_request:

	jobs:
	build:
	uses: ./.github/workflows/build.yaml
	scan:
	name: Trivy scan
	needs: build
	runs-on: ubuntu-20.04
	steps:
	- name: Checkout code
	uses: actions/checkout@v3
	- name: Install skopeo
	run: \|
	sudo snap install --devmode --channel edge skopeo
	- name: Install and configure microk8s
	run: \|
	make microk8s
	- name: Get Artifact Name
	id: artifact
	run: \|
	ARTIFACT=$(make help \| grep 'Artifact: ')
	echo "name=${ARTIFACT#'Artifact: '}" >> $GITHUB_OUTPUT
	- name: Download artifact
	uses: actions/download-artifact@v3
	with:
	name: charmed-spark
	path: charmed-spark
	- name: Import locally
	run: \|
	# Unpack artifact
	mv charmed-spark/${{ steps.artifact.outputs.name }} .
	ls -larth
	rmdir charmed-spark
	docker import ${{ steps.artifact.outputs.name }} ghcr.io/canonical/test-charmed-spark:test
	# Import artifact into docker with new tag
	# sg microk8s -c "microk8s ctr images import --base-name ghcr.io/canonical/test-charmed-spark:test ${{ steps.artifact.outputs.name }}"
	docker images
	sg microk8s -c "microk8s ctr images list"
	docker tag ghcr.io/canonical/test-charmed-spark:test trivy/charmed-spark:test
	docker images
	- name: Run Trivy vulnerability scanner
	uses: aquasecurity/trivy-action@master
	with:
	image-ref: 'trivy/charmed-spark:test'
	format: 'sarif'
	output: 'trivy-results.sarif'
	severity: 'MEDIUM,HIGH,CRITICAL'

	- name: Upload Trivy scan results to GitHub Security tab
	uses: github/codeql-action/upload-sarif@v2
	if: always()
	with:
	sarif_file: 'trivy-results.sarif'

Provide feedback