Add an option to not have full depth when no tag matches the expression and config to limit the depth #784

	name: "CodeQL"

	on:
	push:
	branches: [master, ]
	pull_request:
	# The branches below must be a subset of the branches above
	branches: [master]
	schedule:
	- cron: '0 4 * * 3'

	jobs:
	analyse:
	name: Analyse
	runs-on: ubuntu-latest

	steps:
	- name: Checkout repository
	uses: actions/checkout@v2
	with:
	# We must fetch at least the immediate parents so that if this is
	# a pull request then we can checkout the head.
	fetch-depth: 2

	# If this run was triggered by a pull request event, then checkout
	# the head of the pull request instead of the merge commit.
	- run: git checkout HEAD^2
	if: ${{ github.event_name == 'pull_request' }}

	# Initializes the CodeQL tools for scanning.
	- name: Initialize CodeQL
	uses: github/codeql-action/init@v1
	# Override language selection by uncommenting this and choosing your languages
	# with:
	# languages: go, javascript, csharp, python, cpp, java

	# Autobuild attempts to build any compiled languages (C/C++, C#, or Java).
	# If this step fails, then you should remove it and run the build manually (see below)
	- name: Autobuild
	uses: github/codeql-action/autobuild@v1

	# ℹ️ Command-line programs to run using the OS shell.
	# 📚 https://git.io/JvXDl

	# ✏️ If the Autobuild fails above, remove it and uncomment the following three lines
	# and modify them (or add more) to build your code if your project
	# uses a compiled language

	#- run: \|
	# make bootstrap
	# make release

	- name: Perform CodeQL Analysis
	uses: github/codeql-action/analyze@v1

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