Refactor `_evaluate_gradient` for `param_shift` (#5666) #1672

	name: Docker builds
	on:
	push:
	branches:
	- master

	jobs:
	base-tests:
	runs-on: ubuntu-latest

	steps:
	- name: Cancel Previous Runs
	uses: styfle/[email protected]
	with:
	access_token: ${{ github.token }}

	- uses: actions/checkout@v2
	with:
	fetch-depth: 2

	- name: Build & test PennyLane
	run: make -f docker/Makefile build-base

Provide feedback