Welcome external-to-google contributors with a nice message and assig…

…nee. (#1275)

Merged PR #1275.

.ci/ci.yml.tmpl

@@ -98,10 +98,29 @@ resources:
         token: ((github-account.password))
 
 jobs:
+    - name: respond-to-community-pr
+      plan:
+          - get: magic-modules-external-prs
+            trigger: true
+          - get: magic-modules-gcp
+            # NOTE: we do NOT run a script from the external PR!
+          - task: write-welcome-message
+            file: magic-modules-gcp/.ci/magic-modules/welcome-contributor.yml
+          - put: magic-modules-external-prs
+            params:
+                status: pending
+                path: magic-modules-external-prs
+                label: community
+                comment: comment/pr_comment
+                assignee_file: comment/assignee
+            get_params:
+                skip_clone: true
+
     - name: authorize-single-rev
       plan:
           - get: magic-modules-external-prs
             trigger: false
+            passed: [respond-to-community-pr]
           - put: magic-modules-new-prs
             params:
                 status: pending

.ci/magic-modules/welcome-contributor.sh

@@ -0,0 +1,10 @@
+#!/bin/bash
+echo > comment/pr_comment << EOF
+Hello!  I am a robot who works on Magic Modules PRs.
+
+I have detected that you are a community contributor, so your PR will be assigned to someone with a commit-bit on this repo for initial review.  They will authorize it to run through our CI pipeline, which will generate downstream PRs.
+
+Thanks for your contribution!  A human will be with you soon.
+EOF
+
+shuf -n 1 <(printf "ndmckinley\nrambleraptor\nchrisst\nrileykarson\nSirGitsalot\nslevenick") > comment/assignee

.ci/magic-modules/welcome-contributor.yml

@@ -0,0 +1,23 @@
+---
+# This file takes one input: magic-modules in detached-HEAD state.
+# It spits out "magic-modules-branched", a magic-modules repo on a new branch (named
+# after the HEAD commit on the PR).
+platform: linux
+
+image_resource:
+    type: docker-image
+    source:
+        # This task requires a container with 'git', 'python', and the pip
+        # package 'pygithub'.
+        repository: gcr.io/magic-modules/python
+        tag: '1.0'
+
+inputs:
+    - name: magic-modules-external-prs
+    - name: magic-modules-gcp
+
+outputs:
+    - name: comment
+
+run:
+    path: magic-modules-gcp/.ci/magic-modules/welcome-contributor.sh