docs(srv): jobs commands and args MTA-6609

pages/serverless-jobs/concepts.mdx

@@ -8,6 +8,25 @@ dates:
 ---
 import ServerlessConcepts from '@macros/serverless/serverless-concepts.mdx'
 
+## Commands and arguments
+
+Serverless Jobs allows you to customize the `command` and `args` instructions of your container image directly from the [Scaleway console](https://console.scaleway.com) and from the [Scaleway API](https://www.scaleway.com/en/developers/api/serverless-jobs/).
+
+- The `command` instruction defines the command, process, or script executed when your job starts.
+- The `args` instruction defines the arguments passed to the `command` instruction. Arguments can be passed as environment variables, as shown in the example below.
+
+**Example**
+
+```yaml
+env:
+- name: MESSAGE
+  value: "hello world"
+command: ["/bin/echo"]
+args: ["$(MESSAGE)"]
+```
+
+Refer to the [official Kubernetes documentation](https://kubernetes.io/docs/tasks/inject-data-application/define-command-argument-container/) for more information on commands and arguments behavior.
+
 ## Container Registry
 
 Container Registry is the place where your images are stored before being deployed. We recommend using Scaleway Container Registry for optimal integration. See the [migration guide](/serverless-jobs/api-cli/migrate-external-image-to-scaleway-registry/) for full details.

pages/serverless-jobs/how-to/create-job.mdx

@@ -58,7 +58,7 @@ Scaleway's Serverless Jobs allows you to create jobs from several container [reg
     - Customize the ephemeral storage for your job according to your requirements. The data stored in your job is not retained once it is finished.
     </TabsTab>
     <TabsTab label="Execution">
-    1. Add a **startup command** to your job. It will be executed every time your job is run.
+    1. Add [commands and arguments](/serverless-jobs/concepts/#commands-and-arguments) to your job. they will be executed every time your job is run.
     2. Set a **maximum duration** to your job to stop it automatically if it does not complete within this limit.
     </TabsTab>
 </Tabs>

pages/serverless-jobs/how-to/migrate-startup-command-to-command-args.mdx

@@ -0,0 +1,70 @@
+---
+title: How to migrate from startup command to command and arguments
+description: How to migrate from the legacy startup command system to the modern commands and arguments for Scaleway Serverless Jobs.
+tags: containers
+dates:
+  validation: 2025-12-23
+  posted: 2025-12-23
+---
+
+import Requirements from '@macros/iam/requirements.mdx'
+
+The  Serverless Jobs `v1alpha2` API introduces a new startup execution mechanism based on [commands and arguments](/serverless-containers/concepts/#commands-and-arguments), replacing the legacy startup command.
+
+The Scaleway console allows you to quickly and easily migrate your existing jobs to the new system.
+
+<Requirements />
+
+- A Scaleway account logged into the [console](https://console.scaleway.com)
+- [Owner](/iam/concepts/#owner) status or [IAM permissions](/iam/concepts/#permission) allowing you to perform actions in the intended Organization
+- An existing job that uses a startup command
+
+## How to migrate from startup command to commands and arguments
+
+1. Click **Jobs** in the **Serverless** section of the side menu. The jobs page displays.
+
+2. Click the name of the job you want to manage, then click the **Settings** tab.
+
+3. Scroll down to the **Configure advanced options**, then click the **Execution** tab.
+
+4. Click the **Upgrade** button. A pop-up displays.
+
+5. Split your existing startup command into a command (which corresponds to the `ENTRYPOINT` Docker instruction), and arguments (which correspond to the `CMD` Docker instruction).
+
+6. Click **Upgrade to the new format** to finish.
+
+Your Serverless Job now uses the command and arguments mechanism.
+
+## Migration examples
+
+### Simple command
+
+**Legacy startup command**
+
+```bash
+sleep 60s
+```
+
+**Corresponding command and arguments**
+
+```yaml
+command: [sleep]
+args: [60s]
+```
+
+### Complex command
+
+**Legacy startup command**
+
+```bash
+/app/migrate up --database "$DB_URL" --password "$DB_PASSWORD" --port 3002
+```
+
+**Corresponding command and arguments**
+
+```yaml
+ command: [/app/migrate]
+  args: [up, --database, "$(DB_URL)", --password, "$(DB_PASSWORD)", --port, 3002]
+```
+
+Refer to the [official Kubernetes documentation](https://kubernetes.io/docs/tasks/inject-data-application/define-command-argument-container/) for more information on command and arguments behavior and syntax.

pages/serverless-jobs/menu.ts

@@ -58,6 +58,10 @@ export const serverlessJobsMenu = {
           label: 'Configure alerts for a job',
           slug: 'configure-alerts-jobs',
         },
+        {
+          label: 'Migrate from startup command to command and arguments',
+          slug: 'migrate-startup-command-to-command-args',
+        },
         {
           label: 'Delete a job',
           slug: 'delete-job',