Don't run ssh_src test as user test when it's triggered by Github Action

Currently, testing farm doesn't support running a test as specified
user.

Author: coiby

.github/workflows/main.yml

@@ -44,3 +44,4 @@ jobs:
           # Avoid using xen guests as some machines don't support kdump
           tmt_hardware: '{"virtualization.hypervisor": "!= xen"}'
           pipeline_settings: '{"type": "tmt-multihost"}'
+          tmt_context: "trigger=GitHub_Action"

plans/ssh_src.fmf

@@ -27,3 +27,10 @@ adjust:
          - name: server
            how: connect
            guest: $@KAB_SERVER_IP_SRC
+
+
+    # Currently, testing farm doesn't support run the test with specified user name
+    - when: trigger == GitHub_Action
+      provision:
+         - name: client
+         - name: server