[PATCH 1/2] CI: Allow job tag to be optionally set globally

[Peter Hoyes]

From: Peter Hoyes <Peter.Hoyes at arm.com>

The default behavior of Gitlab runners is to only run jobs which match
the configured tag, although there is an option to run untagged jobs
[1].

To support running the CI in more complex environments where different
types of runners may be present that support different tags, allow the
DEFAULT_TAG for all jobs in the pipeline to be set globally using an
environment variable. An empty default value is provided to retain
support for untagged runners.

[1] https://docs.gitlab.com/ee/ci/runners/configure_runners.html#use-tags-to-control-which-jobs-a-runner-can-run

Signed-off-by: Peter Hoyes <Peter.Hoyes at arm.com>
---
 .gitlab-ci.yml | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 272d69e220..d54694e016 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -1,5 +1,12 @@
 # SPDX-License-Identifier: GPL-2.0+
 
+variables:
+  DEFAULT_TAG: ""
+
+default:
+  tags:
+    - ${DEFAULT_TAG}
+
 # Grab our configured image.  The source for this is found
 # in the u-boot tree at tools/docker/Dockerfile
 image: trini/u-boot-gitlab-ci-runner:jammy-20230126-10Feb2023
-- 
2.34.1