ci/workflow: add rules to run pipelines
Pipelines will be triggered in the following scenarios:
- When a merge request (MR) is created or modified
- When triggered from the web UI
- On a scheduled basis
- When a tag is pushed
- When the default branch is modified
Signed-off-by: Leandro Belli leandro.belli@arm.com Change-Id: Iae09277ae65fa54c47f6f21f47853e08ec63fa44