fix: add conditional logic to drush deploy quicksilver script (#484)

`drush deploy` that runs in CI was getting no output because it was first running on the platform from Quicksilver.
This updated script uses Pantheon's workflow API endpoint to check if the sync_code hook was initiated by our machine user or not.
This commit also renames this file and references in pantheon.yml, since it is now doing more than just a config import.

pantheon.yml

@@ -5,15 +5,15 @@ workflows:
   clone_database:
     after:
       - type: webphp
-        description: Import configuration from .yml files
-        script: private/scripts/confim.php
+        description: Run drush deploy
+        script: private/scripts/drush_deploy.php
   deploy:
     after:
       - type: webphp
-        description: Import configuration from .yml files
-        script: private/scripts/confim.php
+        description: Run drush deploy
+        script: private/scripts/drush_deploy.php
   sync_code:
     after:
       - type: webphp
-        description: Import configuration from .yml files
-        script: private/scripts/confim.php
+        description: Run drush deploy
+        script: private/scripts/drush_deploy.php

web/private/scripts/drush_deploy.php

@@ -0,0 +1,50 @@
+<?php
+/*
+* This script conditionally runs `drush deploy`.
+* We only want it to run conditionally if:
+*   1. The current workflow is a code sync
+*   2. The previous workflow applied upstream updates
+*   3. The user applying upstream updates is not [email protected]
+* This stops it from running from Quicksilver when we are updating sites in CI,
+* but lets it run when manually applied from a site dashboard.
+* This allows for the command output to be captured in CI.
+*/
+
+$workflowType = $_POST['wf_type'];
+$userEmail = $_POST['user_email'];
+$skipMessage = "Skipping drush deploy...\n";
+$runMessage = "Running drush deploy...\n";
+
+// Handle code_sync workflows.
+if (in_array($workflowType, ['sync_code', 'sync_code_with_build'])) {
+  $workflows = json_decode(pantheon_curl('https://api.live.getpantheon.com/sites/self/workflows?limit=5', NULL, 8443, 'GET')['body']);
+
+  // sync_code is always run by the Pantheon user, so we need to check
+  // if apply_upstream_updates was a nearby previous workflow triggered by a different user.
+  // Get only the first occurence in case there are multiple.
+  $previousWorkflow = null;
+  foreach ($workflows as $workflow) {
+    if ($workflow->type == 'apply_upstream_updates') {
+      $previousWorkflow = $workflow;
+      break;
+    }
+  }
+
+  if ($previousWorkflow && $previousWorkflow->user_email !== '[email protected]') {
+    print $runMessage;
+    passthru('drush deploy');
+  }
+  else {
+    print $skipMessage;
+  }
+}
+// Handle deploy workflows.
+elseif ($workflowType == 'deploy' && $userEmail !== '[email protected]') {
+  print $runMessage;
+  passthru('drush deploy');
+}
+// Handle any other workflows where it should always run.
+else {
+  print $runMessage;
+  passthru('drush deploy');
+}