Improve the possibility to inherit zuul jobs

So far it takes some effort and workaround to inherit zuul jobs,
airship-jarvis, in particular. Gate scripts are running from the
directory different from the opendev.org/airship/charts when inheriting.

Thus, adding a single variable (gate_scripts_relative_path) that is
responsible for setting a directory for the gate scripts should solve
the issue and improve the inheritance.

Change-Id: Icc06211a8d5a0814f5e902ebee97d440d3d2943a

roles/gather-logs/tasks/main.yaml

@@ -16,7 +16,7 @@
   environment:
     LOGDIR: "{{ logs_dir }}"
   args:
-    chdir: "{{ zuul.project.src_dir }}"
+    chdir: "{{ zuul.project.src_dir }}/{{ gate_scripts_relative_path | default('') }}"
 
 - name: Upload the logs
   synchronize:

roles/run-script/tasks/main.yaml

@@ -17,6 +17,6 @@
   vars:
     script_path: "{{ script }}"
   args:
-    chdir: "{{ zuul.project.src_dir }}"
+    chdir: "{{ zuul.project.src_dir }}/{{ gate_scripts_relative_path | default('') }}"
   environment:
     FEATURE_GATES: "{{ aio_params.feature_gates | default('') }}"

zuul.d/jobs.yaml

@@ -29,6 +29,7 @@
       aio_params:
         feature_gates: ""
       collect_kubernetes_logs_namespace: tekton-pipelines
+      gate_scripts_relative_path: ../charts
       gate_scripts:
         - ./tools/gate/jarvis/050-setup-development-ca.sh
         - ./tools/gate/jarvis/100-deploy-k8s.sh
@@ -54,6 +55,7 @@
       aio_params:
         feature_gates: ""
       collect_kubernetes_logs_namespace: tekton-pipelines
+      gate_scripts_relative_path: ../charts
       gate_scripts:
         - ./tools/gate/jarvis/050-setup-development-ca.sh
         - ./tools/gate/jarvis/100-deploy-k8s.sh