Add flatpak workflow for GitHub Actions #2

	name: Build Flatpak

	on: [push, pull_request, workflow_dispatch]

	jobs:
	flatpak:
	name: "Flatpak"
	runs-on: ubuntu-latest
	container:
	image: bilelmoussaoui/flatpak-github-actions:kde-6.7
	options: --privileged

	steps:
	- name: Checkout openchemistry
	uses: actions/checkout@v4
	with:
	repository: openchemistry/openchemistry
	submodules: false

	- name: Checkout avogadroapp
	uses: actions/checkout@v4
	with:
	repository: openchemistry/avogadroapp
	path: avogadroapp

	- name: Checkout avogadrolibs
	uses: actions/checkout@v4
	with:
	path: avogadrolibs

	- name: Checkout i18n
	uses: actions/checkout@v4
	with:
	repository: openchemistry/avogadro-i18n
	path: avogadro-i18n

	- name: Checkout avogadrogenerators
	uses: actions/checkout@v4
	with:
	repository: openchemistry/avogenerators
	path: avogadrogenerators

	- name: Checkout crystals
	uses: actions/checkout@v4
	with:
	repository: openchemistry/crystals
	path: crystals

	- name: Checkout fragments
	uses: actions/checkout@v4
	with:
	repository: openchemistry/fragments
	path: fragments

	- name: Checkout molecules
	uses: actions/checkout@v4
	with:
	repository: openchemistry/molecules
	path: molecules

	- name: Checkout Flathub shared-modules
	uses: actions/checkout@v4
	with:
	repository: flathub/shared-modules
	path: shared-modules

	- name: Build with flatpak-builder
	uses: flatpak/flatpak-github-actions/flatpak-builder@v6
	with:
	bundle: avogadro2.flatpak
	branch: nightly
	manifest-path: avogadroapp/flatpak/org.openchemistry.Avogadro2.yaml
	cache-key: flatpak-builder-${{ github.sha }}

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