Include the share folder parameter

Introduce the SHARE_FOLDER parameter which indicates where to locate
the job's share folder which is further populated by several
repositories (see [1]) and consequently share it to downstream
jobs. For maximum repository reuse, upstream jobs should populate it
so any downstream job can benefit and avoid re-populating. The latter
implied that several upstream level jobs required repository
parameters for TF-M related repositories.

[1] https://review.trustedfirmware.org/c/ci/tf-m-ci-scripts/+/11562

Signed-off-by: Leonardo Sandoval <leonardo.sandoval@linaro.org>
Change-Id: I8bef216418891e39176dcd7b3bd2560a9f3afc22
diff --git a/tf-m-build-docs.yaml b/tf-m-build-docs.yaml
index 0f504d5..e623f07 100644
--- a/tf-m-build-docs.yaml
+++ b/tf-m-build-docs.yaml
@@ -79,6 +79,10 @@
       - string:
           name: 'TFM_TESTS_REFSPEC'
           default: 'refs/heads/master'
+      - string:
+          name: SHARE_FOLDER
+          default: '/srv/shared/${JOB_NAME}/${BUILD_NUMBER}'
+          description: 'Folder containing shared repositories for downstream pipeline jobs'
     wrappers:
         - timestamps
     pipeline-scm: