Authenticate theme push when used programmatically

CLI commands push and pull are exported publicly
through @shopify/cli so external packages (like
shopkeeper) can use them. When push is used
programmatically we need to authenticate inside
the function as we wont have access to the session
created by ThemeCommand

Author: dejmedus

packages/theme/src/cli/services/push.ts

@@ -7,7 +7,8 @@ import {findOrSelectTheme} from '../utilities/theme-selector.js'
 import {Role} from '../utilities/theme-selector/fetch.js'
 import {configureCLIEnvironment} from '../utilities/cli-config.js'
 import {runThemeCheck} from '../commands/theme/check.js'
-import {AdminSession} from '@shopify/cli-kit/node/session'
+import {ensureThemeStore} from '../utilities/theme-store.js'
+import {AdminSession, ensureAuthenticatedThemes} from '@shopify/cli-kit/node/session'
 import {themeCreate, fetchChecksums, themePublish} from '@shopify/cli-kit/node/themes/api'
 import {Result, Theme} from '@shopify/cli-kit/node/themes/types'
 import {outputResult} from '@shopify/cli-kit/node/output'
@@ -122,6 +123,10 @@ export async function push(
 ) {
   const environment = flags.environment?.[0]
 
+  // when push is used programmatically, we don't have an admin session, so need to create one
+  const session =
+    adminSession ?? (await ensureAuthenticatedThemes(ensureThemeStore({store: flags.store}), flags.password))
+
   if (flags.strict) {
     const outputType = flags.json ? 'json' : 'text'
     const {offenses} = await runThemeCheck(flags.path ?? cwd(), outputType)
@@ -156,7 +161,7 @@ export async function push(
     return
   }
 
-  const selectedTheme: Theme | undefined = await createOrSelectTheme(adminSession, flags, multiEnvironment)
+  const selectedTheme: Theme | undefined = await createOrSelectTheme(session, flags, multiEnvironment)
   if (!selectedTheme) {
     return
   }