Merge "Add role to ensure per-node output dirs exist"

roles/ensure-output-dirs/README.rst

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+Ensure output directories are in place
+
+**Role Variables**
+
+.. zuul:rolevar:: zuul_output_dir
+   :default: {{ ansible_user_dir }}/zuul-output
+
+   Base directory for collecting job output.

roles/ensure-output-dirs/defaults/main.yaml

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+zuul_output_dir: "{{ ansible_user_dir }}/zuul-output"

roles/ensure-output-dirs/tasks/main.yaml

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+- name: Ensure Zuul Output directories exist
+  file:
+    path: "{{ zuul_output_dir }}/{{ item }}"
+    state: directory
+  with_items:
+    - logs
+    - artifacts
+    - docs