Allow custom naming of service container for the k8s executor

What does this MR do?

This MR is a take over of the Community contribution !4273 (closed)

When a service is configured and an alias is given, the alias is used as the service name instead of the usual svc-N

Documentation update MRs

• gitlab!180859 (merged)
• gitlab!181125 (merged)

Why was this MR needed?

Make it more practical to use pod_spec on service container as their name is an unique identifier allowing strategic patch strategy

What's the best way to test this MR?

!4273 (comment 1606210496)

gitlab-ci

variables:
  FF_USE_POWERSHELL_PATH_RESOLVER: "true"
  FF_RETRIEVE_POD_WARNING_EVENTS: "true"
  FF_PRINT_POD_EVENTS: "true"
  FF_SCRIPT_SECTIONS: "true"

job:
  image: alpine:latest
  script: |
    sleep 10
  services:
    - name: alpine:latest
      alias: alpine,alpine-latest
    - name: alpine:latest
      alias: alpine,alpine-latest
    - name: mysql:latest
      alias: mysql, mysql-latest
    - name: mysql:latest
      alias: mysql, mysql-latest

config.toml

listen_address = ":9252"
concurrent = 3
check_interval = 1
# log_level = "debug"
log_format = "runner"
connection_max_age = "15m0s"
shutdown_timeout = 0

[session_server]
  session_timeout = 1800

[[runners]]
  name = "investigation"
  limit = 50
  url = "https://gitlab.com/"
  id = 0
  token = "glrt-REDACTED"
  token_obtained_at = 2024-09-30T14:38:04.623237Z
  executor = "kubernetes"
  shell = "bash"
  [runners.feature_flags]
    FF_USE_ADVANCED_POD_SPEC_CONFIGURATION = true
    FF_USE_POD_ACTIVE_DEADLINE_SECONDS = true
    FF_PRINT_POD_EVENTS = true
    FF_USE_FASTZIP = true
  [runners.kubernetes]
    host = ""
    bearer_token_overwrite_allowed = false
    image = ""
    namespace = ""
    namespace_overwrite_allowed = ""
    namespace_per_job = false
    privileged = true
    node_selector_overwrite_allowed = ".*"
    node_tolerations_overwrite_allowed = ""
    pod_labels_overwrite_allowed = ""
    service_account_overwrite_allowed = ""
    [runners.kubernetes.pod_labels]
    [[runners.kubernetes.volumes.empty_dir]]
      name = "docker-certs"
      mount_path = "/certs/client"
      medium = "Memory"
    [runners.kubernetes.dns_config]

The job will pass and the service container names can be seen in the job log:

[...]
Normal   Pulled   Successfully pulled image "alpine:latest" in 132ms (132ms including waiting). Image size: 3652536 bytes.
Normal   Created   Created container alpine  <================= Container name : alpine
Normal   Started   Started container alpine
Normal   Pulling   Pulling image "alpine:latest"
Normal   Pulled   Successfully pulled image "alpine:latest" in 116ms (116ms including waiting). Image size: 3652536 bytes.
Normal   Created   Created container alpine-latest  <================= Container name : alpine-latest
Normal   Started   Started container alpine-latest
Normal   Pulling   Pulling image "mysql:latest"
Normal   Pulled   Successfully pulled image "mysql:latest" in 127ms (127ms including waiting). Image size: 241164695 bytes.
Normal   Created   Created container mysql  <================= Container name : mysql
Normal   Started   Started container mysql
Normal   Pulling   Pulling image "mysql:latest"
Normal   Pulled   Successfully pulled image "mysql:latest" in 139ms (139ms including waiting). Image size: 241164695 bytes.
Normal   Created   Created container mysql-latest  <================= Container name : mysql-latest
[...]

What are the relevant issue numbers?

fixes gitlab#421131 (closed)