Adds SECURITY.md and scanning workflow (#1437) #2

	---
	name: security

	# We don't scan documentation-only commits.
	on: # yamllint disable-line rule:truthy
	push: # non-tagged pushes to master
	branches:
	- master
	tags-ignore:
	- '*'
	paths-ignore:
	- '*/.md'
	- './build-bin/*lint'
	- ./build-bin/mlc_config.json
	pull_request: # pull requests targeted at the master branch.
	branches:
	- master
	paths-ignore:
	- '*/.md'
	- './build-bin/*lint'
	- ./build-bin/mlc_config.json

	jobs:
	security:
	name: security
	runs-on: ubuntu-22.04 # newest available distribution, aka jellyfish
	# skip commits made by the release plugin
	if: "!contains(github.event.head_commit.message, 'maven-release-plugin')"
	steps:
	- name: Checkout Repository
	uses: actions/checkout@v4
	- uses: actions/cache@v4
	name: Cache Trivy Database
	with:
	path: .trivy
	key: ${{ runner.os }}-trivy
	restore-keys: ${{ runner.os }}-trivy
	- name: Run Trivy vulnerability and secret scanner
	uses: aquasecurity/trivy-action@master
	id: trivy
	with:
	scan-type: 'fs'
	scan-ref: '.' # scan the entire repository
	scanners: vuln,secret
	exit-code: '1'
	severity: HIGH,CRITICAL
	output: trivy-report.md
	cache-dir: .trivy
	- name: Set Summary
	shell: bash
	if: ${{ failure() && steps.trivy.conclusion == 'failure' }}
	# Add the Trivy report to the summary
	#
	# Note: This will cause a workflow error if trivy-report.md > the step
	# limit 1MiB. If this was due to too many CVEs, consider fixing them ;)
	run: cat trivy-report.md >> $GITHUB_STEP_SUMMARY

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