Add GH action to close stale PRs (#977) #1148

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	name: Validate Bicep Code
	on:
	pull_request:
	branches:
	- edge
	- v*
	push:
	branches:
	- edge
	- v*
	jobs:
	build:
	name: Validate Bicep Code
	runs-on: ubuntu-latest
	steps:
	- name: Check out repo
	uses: actions/checkout@v2
	- name: Download rad-bicep
	run: \|
	oras pull ghcr.io/radius-project/radius/bicep/rad-bicep/linux-x64:latest
	chmod +x rad-bicep
	./rad-bicep --version
	- name: Verify Bicep files
	run: python ./.github/scripts/validate_bicep.py

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