fix(k8s): add missing command argument to helm module test schema

We were already accounting for this in the code, was just missing
from the validation schema.

docs/reference/module-types/helm.md

@@ -664,6 +664,25 @@ tests:
         - my-server.js
 ```
 
+### `tests[].command[]`
+
+[tests](#tests) > command
+
+The command/entrypoint used to run the test inside the container.
+
+| Type            | Required |
+| --------------- | -------- |
+| `array[string]` | No       |
+
+Example:
+
+```yaml
+tests:
+  - command:
+    - /bin/sh
+    - '-c'
+```
+
 ### `tests[].args[]`
 
 [tests](#tests) > args
@@ -674,6 +693,15 @@ The arguments to pass to the pod used for testing.
 | --------------- | -------- |
 | `array[string]` | No       |
 
+Example:
+
+```yaml
+tests:
+  - args:
+    - npm
+    - test
+```
+
 ### `tests[].env`
 
 [tests](#tests) > env
@@ -791,6 +819,7 @@ tests:
       containerName:
       containerModule:
       hotReloadArgs:
+    command:
     args:
     env: {}
 timeout: 300

garden-service/src/plugins/kubernetes/helm/config.ts

@@ -126,8 +126,12 @@ export const execTestSchema = baseTestSpecSchema
         If not specified, the \`serviceResource\` configured on the module will be used. If neither is specified,
         an error will be thrown.`,
       ),
+    command: joi.array().items(joi.string())
+      .description("The command/entrypoint used to run the test inside the container.")
+      .example([commandExample, {}]),
     args: joi.array().items(joi.string())
-      .description("The arguments to pass to the pod used for testing."),
+      .description("The arguments to pass to the pod used for testing.")
+      .example([["npm", "test"], {}]),
     env: containerEnvVarsSchema,
   })