Add fetch-python-sdist-output role

Create a role to upload python sdist results to artifact directory on
executor.

Change-Id: I05158958af793fcfaef1d978cb7f38a38af95fc6
Signed-off-by: Paul Belanger <pabelanger@redhat.com>

roles/fetch-python-sdist-output/README.rst

@@ -0,0 +1 @@
+Collect output from a python sdist build

roles/fetch-python-sdist-output/tasks/main.yaml

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+- name: Find tarballs and wheels in dist folder
+  find:
+    file_type: file
+    paths: "src/{{ zuul.project.canonical_name }}/dist"
+    patterns: "*.tar.gz,*.whl"
+  register: result
+
+- name: Display stat for tarballs and wheels
+  stat:
+    path: "{{ item.path }}"
+  with_items: "{{ result.files }}"
+
+- name: Ensure artifacts directory exists
+  file:
+    path: "{{ zuul.executor.work_root }}/artifacts"
+    state: directory
+  delegate_to: localhost
+
+- name: Collect artifacts
+  synchronize:
+    dest: "{{ zuul.executor.work_root }}/artifacts/"
+    mode: pull
+    src: "{{ item.path }}"
+    verify_host: true
+  with_items: "{{ result.files }}"