Pull request 2278: AG-29637 Checkout publisher

Squashed commit of the following:

commit fec1efed4680076b33141a72e36904c27a04677d
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Tue Sep 10 19:14:59 2024 +0300

    bamboo: add publisher

bamboo-specs/test.yaml

@@ -143,6 +143,12 @@
     'other':
          'clean-working-dir': true
     'tasks':
+      # TODO(e.burkov):  Remove after test.
+      - 'checkout':
+            'repository': 'bamboo-deploy-publisher'
+            # The paths are always relative to the working directory.
+            'path': 'bamboo-deploy-publisher'
+            'force-clean-build': true
       - 'checkout':
             'force-clean-build': true
       - 'script':