Restore deepks unit test in gamma-only case and make H_V_delta have full size of Hamiltonian in multi-k case #4940

	name: Pyabacus Build and Test

	on:
	pull_request:

	jobs:
	test:
	name: PyTest
	runs-on: ubuntu-latest
	container:
	image: ghcr.io/deepmodeling/abacus-gnu
	steps:
	- name: Checkout
	uses: actions/checkout@v4
	- name: Set up Python
	uses: actions/setup-python@v5
	with:
	python-version: 3.8
	- name: Build Pyabacus
	run: \|
	cd python/pyabacus
	python -m pip install -v .[test]
	- name: Test Pyabacus
	run: \|
	cd python/pyabacus/tests
	pytest -v

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