Add e2e test about dnscache #3902

	# name: Unit Test Coverage
	# on:
	# push:
	# paths-ignore:
	# - "install.sh"
	# - "tests/vagrant/**"
	# pull_request:
	# paths-ignore:
	# - "install.sh"
	# - "tests/vagrant/**"
	# jobs:
	# test:
	# name: Unit Tests
	# runs-on: ${{ matrix.os }}
	# strategy:
	# matrix:
	# os: [ubuntu-20.04]
	# timeout-minutes: 20
	# steps:
	# - name: Install Go
	# uses: actions/setup-go@v3
	# with:
	# go-version: '1.19.3'
	# - name: Checkout
	# uses: actions/checkout@v3
	# with:
	# fetch-depth: 1
	# - name: Run Unit Tests
	# run: \|
	# go test -coverpkg=./... -covermode=atomic -coverprofile=coverage.out ./pkg/... -run Unit
	# go tool cover -func coverage.out
	# - name: On Failure, Launch Debug Session
	# if: ${{ failure() }}
	# uses: mxschmitt/action-tmate@v3
	# timeout-minutes: 2
	# - name: Upload Results To Codecov
	# uses: codecov/codecov-action@v1
	# with:
	# files: ./coverage.out
	# flags: unittests # optional
	# verbose: true # optional (default = false)

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