fix(alpine): add --no-cache to apk add #564

	name: Build & Test
	on: [push, pull_request]

	jobs:
	test:
	name: Build & Test
	runs-on: ubuntu-20.04

	strategy:
	matrix:
	image: [alpine, ubuntu, rhel]

	env:
	BASE: ${{ matrix.image }}
	KONG_DOCKER_TAG: kong-${{ matrix.image }}

	steps:
	- name: Checkout
	uses: actions/checkout@v2
	- name: Build
	run: \|
	make build
	- name: Test
	shell: 'script -q -e -c "bash {0}"'
	run: \|
	make test
	- name: Push RHEL
	if: ${{ github.event_name == 'create' && github.event.ref_type == 'tag' }}
	run: \|
	make release-rhel

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