Run bridges zombienet tests on CI (#2439)

Brridges zombienet tests are non-standard - zombienet currently missing
multiple relay chains support (see e.g.
https://github.com/paritytech/zombienet/pull/796), so we need to go live
with two relay networks, their parachains + custom test runner (which
e.g. doesn't shutdown net when its tests are finished and instead waits
for both networks tests to complete). So we are stuck with native
zombienet provider => this PR is an attempt to gather everything in a
single docker container and run tests there ~Draft, because it is far
from finishing - what I want now is to see how it works on CI~

.gitlab/pipeline/zombienet/bridges.yml

@@ -0,0 +1,54 @@
+# This file is part of .gitlab-ci.yml
+# Here are all jobs that are executed during "zombienet" stage for bridges
+
+# common settings for all zombienet jobs
+.zombienet-bridges-common:
+  before_script:
+    # Exit if the job is not merge queue
+    # - if [[ $CI_COMMIT_REF_NAME != *"gh-readonly-queue"* ]]; then echo "I will run only in a merge queue"; exit 0; fi
+    - echo "Zombienet Tests Config"
+    - echo "${ZOMBIENET_IMAGE}"
+    - echo "${GH_DIR}"
+    - echo "${LOCAL_DIR}"
+    - ls "${LOCAL_DIR}"
+    - export DEBUG=zombie,zombie::network-node
+    - export ZOMBIENET_INTEGRATION_TEST_IMAGE="${BRIDGES_ZOMBIENET_TESTS_IMAGE}":${BRIDGES_ZOMBIENET_TESTS_IMAGE_TAG}
+    - echo "${ZOMBIENET_INTEGRATION_TEST_IMAGE}"
+  stage: zombienet
+  image: "${BRIDGES_ZOMBIENET_TESTS_IMAGE}:${BRIDGES_ZOMBIENET_TESTS_IMAGE_TAG}"
+  needs:
+    - job: build-push-image-bridges-zombienet-tests
+      artifacts: true
+  extends:
+    - .kubernetes-env
+    - .zombienet-refs
+  variables:
+    BRIDGES_ZOMBIENET_TESTS_IMAGE_TAG: ${DOCKER_IMAGES_VERSION}
+    BRIDGES_ZOMBIENET_TESTS_IMAGE: "docker.io/paritypr/bridges-zombienet-tests"
+    GH_DIR: "https://github.com/paritytech/polkadot-sdk/tree/${CI_COMMIT_SHA}/bridges/zombienet"
+    LOCAL_DIR: "/builds/parity/mirrors/polkadot-sdk/bridges/zombienet"
+    FF_DISABLE_UMASK_FOR_DOCKER_EXECUTOR: 1
+    RUN_IN_CONTAINER: "1"
+  artifacts:
+    name: "${CI_JOB_NAME}_${CI_COMMIT_REF_NAME}_zombienet_bridge_tests"
+    when: always
+    expire_in: 2 days
+    paths:
+      - ./zombienet-logs
+  after_script:
+    - mkdir -p ./zombienet-logs
+    # copy logs of tests runner (run-tests.sh)
+    - cp -r /tmp/bridges-zombienet-tests.*/tmp.*/tmp.* ./zombienet-logs/
+    # copy logs of all nodes
+    - cp /tmp/zombie*/logs/* ./zombienet-logs/
+# following lines are causing spurious test failures ("At least one of the nodes fails to start")
+#  retry: 2
+#  tags:
+#    - zombienet-polkadot-integration-test
+
+zombienet-bridges-0001-asset-transfer-works:
+  extends:
+    - .zombienet-bridges-common
+  script:
+    - /home/nonroot/bridges-polkadot-sdk/bridges/zombienet/run-tests.sh --docker
+    - echo "Done"