Make happo-ci-github-actions work on master

We want the happo run to succeed, but make no comparisons.

Author: trotzig

happo-ci-github-actions

@@ -3,16 +3,27 @@
 # Make the whole script fail on errors
 set -euo pipefail
 
+
+cat $GITHUB_EVENT_PATH
+
 # Prepare environment variables found in the github event json file.
 ENV_VARS=$(echo "
   const json = require('$GITHUB_EVENT_PATH');
   if (!process.env.PREVIOUS_SHA) {
-    console.log(\`export PREVIOUS_SHA=\${json.pull_request.base.sha}\`);
+    if (json.pull_request) {
+      console.log(\`export PREVIOUS_SHA=\${json.pull_request.base.sha}\`);
+    } else {
+      console.log(\`export PREVIOUS_SHA=\${json.after}\`);
+    }
   }
   if (!process.env.CURRENT_SHA) {
-    console.log(\`export CURRENT_SHA=\${json.pull_request.head.sha}\`);
+    if (json.pull_request) {
+      console.log(\`export CURRENT_SHA=\${json.pull_request.head.sha}\`);
+    } else {
+      console.log(\`export CURRENT_SHA=\${json.after}\`);
+    }
   }
-  if (!process.env.CHANGE_URL) {
+  if (!process.env.CHANGE_URL && json.pull_request) {
     console.log(\`export CHANGE_URL=\${json.pull_request.html_url}\`);
   }
 " | node)