adds assets volume to integration test containers

dapps/valuetransfers/packages/tangle/snapshot_test.go

...s/assets/7R1itJx5hVuo9w9hjg5cwKFmek4HMSoBDgJZN8hKGxih.bin

tools/integration-tests/assets/entrypoint.sh

tools/integration-tests/runTests.sh

tools/integration-tests/tester/docker-compose.yml

tools/integration-tests/tester/framework/docker.go

tools/integration-tests/tester/framework/network.go

tools/integration-tests/tester/framework/parameters.go

tools/integration-tests/tester/go.mod

...ntegration-tests/tester/tests/consensus/consensus_test.go

tools/integration-tests/tester/tests/consensus/main_test.go