Add `FiniteElement::scalar_type` #2006

	name: FFCx integration

	# Install Basix and FFCx and run the FFCx unit tests.

	on:
	pull_request:
	branches:
	- main
	push:
	branches:
	- "main"
	merge_group:
	branches:
	- main
	workflow_dispatch:
	inputs:
	ffcx_branch:
	description: "FFCx branch or tag"
	default: "main"
	type: string
	ufl_branch:
	description: "UFL branch or tag"
	default: "main"
	type: string

	jobs:
	build:
	name: Run FFCx tests
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4
	- name: Set up Python
	uses: actions/setup-python@v5
	with:
	python-version: '3.12'
	- name: Install dependencies
	run: sudo apt-get install -y libopenblas-dev liblapack-dev graphviz libgraphviz-dev ninja-build
	- name: Install UFL (default branch)
	if: github.event_name != 'workflow_dispatch'
	run: pip install git+https://github.com/FEniCS/ufl.git
	- name: Install UFL (specified branch)
	if: github.event_name == 'workflow_dispatch'
	run: pip install git+https://github.com/FEniCS/ufl.git@${{ github.event.inputs.ufl_branch }}
	- name: Install Basix
	run: pip -v install .[ci]
	- name: Get FFCx source (default branch)
	if: github.event_name != 'workflow_dispatch'
	uses: actions/checkout@v4
	with:
	path: ./ffcx
	repository: FEniCS/ffcx
	ref: main
	- name: Get FFCx source (specified branch)
	if: github.event_name == 'workflow_dispatch'
	uses: actions/checkout@v4
	with:
	path: ./ffcx
	repository: FEniCS/ffcx
	ref: ${{ github.event.inputs.ffcx_branch }}
	- name: Install FFCx
	run: pip install ./ffcx[ci]
	- name: Run FFCx tests
	run: pytest -n auto --ignore=ffcx/test/test_lnodes.py ffcx/test

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