Add const where possible and improve the names of temporary variables in the Overlay algorithm #373

	# Do not edit this file, it will be overwritten!
	# The template file can be found in
	# https://github.com/key4hep/key4hep-actions/blob/main/workflows/key4hep-build.yaml
	name: Key4hep build

	on:
	push:
	branches:
	- main
	pull_request:
	workflow_dispatch:
	schedule:
	- cron: '16 5 * * *'

	concurrency:
	group: ${{ github.workflow }}-${{ github.ref }}
	cancel-in-progress: true

	jobs:
	build:
	strategy:
	matrix:
	build_type: ["release", "nightly"]
	image: ["alma9", "ubuntu22"]
	fail-fast: false
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4
	- uses: key4hep/key4hep-actions/key4hep-build@main
	with:
	build_type: ${{ matrix.build_type }}
	image: ${{ matrix.image }}

Provide feedback