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/publish.yml

@@ -66,6 +66,8 @@ publish-rustdoc:
 # note: images are used not only in zombienet but also in rococo, wococo and versi
 .build-push-image:
   image: $BUILDAH_IMAGE
+  extends:
+    - .zombienet-refs
   variables:
     DOCKERFILE: "" # docker/path-to.Dockerfile
     IMAGE_NAME: "" # docker.io/paritypr/image_name
@@ -77,6 +79,7 @@ publish-rustdoc:
       --build-arg VCS_REF="${CI_COMMIT_SHA}"
       --build-arg BUILD_DATE="$(date -u '+%Y-%m-%dT%H:%M:%SZ')"
       --build-arg IMAGE_NAME="${IMAGE_NAME}"
+      --build-arg ZOMBIENET_IMAGE="${ZOMBIENET_IMAGE}"
       --tag "$IMAGE_NAME:${DOCKER_IMAGES_VERSION}"
       --file ${DOCKERFILE} .
     - echo "$PARITYPR_PASS" |
@@ -163,3 +166,22 @@ build-push-image-substrate-pr:
   variables:
     DOCKERFILE: "docker/dockerfiles/substrate_injected.Dockerfile"
     IMAGE_NAME: "docker.io/paritypr/substrate"
+
+# unlike other images, bridges+zombienet image is based on Zombienet image that pulls required binaries
+# from other fresh images (polkadot and cumulus)
+build-push-image-bridges-zombienet-tests:
+  stage: publish
+  extends:
+    - .kubernetes-env
+    - .common-refs
+    - .build-push-image
+  needs:
+    - job: build-linux-stable
+      artifacts: true
+    - job: build-linux-stable-cumulus
+      artifacts: true
+    - job: prepare-bridges-zombienet-artifacts
+      artifacts: true
+  variables:
+    DOCKERFILE: "docker/dockerfiles/bridges_zombienet_tests_injected.Dockerfile"
+    IMAGE_NAME: "docker.io/paritypr/bridges-zombienet-tests"