Add SetContext on Builder interface and GetContext on Biscuit struct. #365

	name: CI

	on:
	pull_request:
	push:
	branches:
	- main

	jobs:
	test:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v3
	- name: Build test environment
	run: docker build --file test.Dockerfile --tag biscuit-go-test .
	- name: Run tests
	run: docker run biscuit-go-test
	lint:
	name: lint
	runs-on: ubuntu-latest
	steps:
	- uses: actions/setup-go@v4
	with:
	go-version: "1.19"
	cache: false
	- uses: actions/checkout@v3
	- name: golangci-lint
	uses: golangci/golangci-lint-action@v3

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