refactor: do all argv parsing in createDeployCommand

This prevents us from loading the `deploy` command's full dependency
tree when we know we can't service the user's request.

Author: ndhoule

src/commands/deploy/deploy.ts

@@ -809,14 +809,6 @@ export const deploy = async (options: DeployOptionValues, command: BaseCommand)
 
   command.setAnalyticsPayload({ open: options.open, prod: options.prod, json: options.json, alias: Boolean(alias) })
 
-  if (options.branch) {
-    warn('--branch flag has been renamed to --alias and will be removed in future versions')
-  }
-
-  if (options.context && !options.build) {
-    return logAndThrowError('--context flag is only available when using the --build flag')
-  }
-
   await command.authenticate(options.auth)
 
   let siteId = site.id || options.site

src/commands/deploy/index.ts

@@ -3,6 +3,7 @@ import { env } from 'process'
 import { Option } from 'commander'
 
 import BaseCommand from '../base-command.js'
+import { logAndThrowError, warn } from '../../utils/command-helpers.js'
 import type { DeployOptionValues } from './option_values.js'
 
 export const createDeployCommand = (program: BaseCommand) =>
@@ -127,6 +128,14 @@ Support for package.json's main field, and intrinsic index.js entrypoints are co
       'netlify deploy --build --context deploy-preview',
     ])
     .action(async (options: DeployOptionValues, command: BaseCommand) => {
+      if (options.branch) {
+        warn('--branch flag has been renamed to --alias and will be removed in future versions')
+      }
+
+      if (options.context && !options.build) {
+        return logAndThrowError('--context flag is only available when using the --build flag')
+      }
+
       const { deploy } = await import('./deploy.js')
       await deploy(options, command)
     })