Add Multi-Lang KubernetesExecutor system test

.github/workflows/k8s-tests.yml

@@ -103,6 +103,9 @@ jobs:
         env:
           EXECUTOR: ${{ matrix.executor }}
           USE_STANDARD_NAMING: ${{ matrix.use-standard-naming }}
+          # Provision + run the lang-SDK coordinator system test in a single variant only
+          # (KubernetesExecutor, standard-naming off) to keep it off the other five k8s jobs.
+          RUN_LANG_SDK_K8S_TESTS: ${{ (matrix.executor == 'KubernetesExecutor' && matrix.use-standard-naming == false) && 'true' || 'false' }}  # yamllint disable-line rule:line-length
           VERBOSE: "false"
       - name: "\
           Print logs ${{ matrix.executor }}-${{ matrix.kubernetes-combo }}-\

dev/breeze/doc/05_test_commands.rst

@@ -565,6 +565,23 @@ All parameters of the command are here:
   :width: 100%
   :alt: Breeze k8s deploy-airflow
 
+Setting up the lang-SDK coordinator system test
+...............................................
+
+``breeze k8s setup-lang-sdk-test`` provisions a cluster for the lang-SDK coordinator
+system test: it builds the Go and Java example bundles, deploys an in-cluster localstack
+S3, uploads the artifacts and the Python stub Dag to their buckets, renders the
+coordinator pod-template image placeholders, and installs the Helm release configured for
+the ``golang`` and ``java`` queues. After it completes, run the test with
+``breeze k8s tests``.
+
+All parameters of the command are here:
+
+.. image:: ./images/output_k8s_setup-lang-sdk-test.svg
+  :target: https://github.com/apache/airflow/main/dev/breeze/images/output_k8s_setup-lang-sdk-test.svg
+  :width: 100%
+  :alt: Breeze k8s setup-lang-sdk-test
+
 Hot-reloading Dags and core sources
 ...................................
 

dev/breeze/doc/images/output_k8s.txt

@@ -1 +1 @@
-bbba8147c6480f8b333ae667f0ace4f5
+bbfb153dc7f511c65455bcf213bef665

dev/breeze/doc/images/output_k8s_run-complete-tests.txt

@@ -1 +1 @@
-7cc20839aa0a13776ae3b70c48b5a522
+bbff103f342a54b5f22b0a3577d3a632

dev/breeze/doc/images/output_k8s_setup-lang-sdk-test.txt

@@ -0,0 +1 @@
+e79130d4518f85b8b1783b9a730f78fa

dev/breeze/doc/images/output_setup_check-all-params-in-groups.txt

@@ -1 +1 @@
-561b619130079265ef547620b63f72cd
+5bc35640bc1faf04a3e60c8c31a5f571