Add in hook extensions to be able to extend all container services

docs/adrs/0134-hook-extensions.md

@@ -29,9 +29,10 @@ In case the hook is able to read the extended spec, it will first create a defau
 3. The volumes are applied in form of appending additional volumes to the default volumes.
 4. The containers are merged based on the name assigned to them:
    1. If the name of the container *is* "$job", the `name` and the `image` fields are going to be ignored and the spec will be applied so that `env`, `volumeMounts`, `ports` are appended to the default container spec created by the hook, while the rest of the fields are going to be applied to the newly created container spec.
-   2. If the name of the container *starts with* "$", and matches the name of the [container service](https://docs.github.com/en/actions/using-containerized-services/about-service-containers), the `name` and the `image` fields are going to be ignored and the spec will be applied to that service container, so that `env`, `volumeMounts`, `ports` are appended to the default container spec for service created by the hook, while the rest of the fields are going to be applied to the created container spec. 
-      If there is no container service with such name defined in the workflow, such spec extension will be ignored.  
-   3. If the name of the container *does not start with* "$", the entire spec of the container will be added to the pod definition.
+   2. If the name of the container *starts with* "$", and matches the name of the [container service](https://docs.github.com/en/actions/using-containerized-services/about-service-containers), the `name` and the `image` fields are going to be ignored and the spec will be applied to that service container, so that `env`, `volumeMounts`, `ports` are appended to the default container spec for service created by the hook, while the rest of the fields are going to be applied to the created container spec.
+      If there is no container service with such name defined in the workflow, such spec extension will be ignored. 
+   3. If the name of the container *is "$default", the `name` and the `image` fields are going to be ignored and the spec will be applied to all service containers that were not extended at point 2.
+   4. If the name of the container *does not start with* "$", the entire spec of the container will be added to the pod definition.
 
 ## Consequences
 

packages/k8s/src/hooks/constants.ts

@@ -44,6 +44,7 @@ export const STEP_POD_NAME_SUFFIX_LENGTH = 8
 export const CONTAINER_EXTENSION_PREFIX = '$'
 export const JOB_CONTAINER_NAME = 'job'
 export const JOB_CONTAINER_EXTENSION_NAME = '$job'
+export const DEFAULT_CONTAINER_EXTENSION_NAME = '$default'
 
 export class RunnerInstanceLabel {
   private podName: string

packages/k8s/src/hooks/prepare-job.ts

@@ -27,7 +27,11 @@ import {
   PodPhase,
   fixArgs
 } from '../k8s/utils'
-import { CONTAINER_EXTENSION_PREFIX, JOB_CONTAINER_NAME } from './constants'
+import {
+  CONTAINER_EXTENSION_PREFIX,
+  JOB_CONTAINER_NAME,
+  DEFAULT_CONTAINER_EXTENSION_NAME
+} from './constants'
 
 export async function prepareJob(
   args: PrepareJobArgs,
@@ -253,6 +257,14 @@ export function createContainerSpec(
     return podContainer
   }
 
+  const all = extension.spec?.containers?.find(
+    c => c.name === DEFAULT_CONTAINER_EXTENSION_NAME
+  )
+
+  if (all) {
+    mergeContainerWithOptions(podContainer, all)
+  }
+
   const from = extension.spec?.containers?.find(
     c => c.name === CONTAINER_EXTENSION_PREFIX + name
   )