Write a warning if there is an error with the workflow

src/init-action.ts

@@ -96,9 +96,29 @@ async function run() {
   try {
     actionsUtil.prepareLocalRunEnvironment();
 
+    const workflowErrors = actionsUtil.validateWorkflow(
+      await actionsUtil.getWorkflow()
+    );
+
+    const workflowErrorMessage =
+      workflowErrors.length > 0
+        ? `${workflowErrors.length} issue${
+            workflowErrors.length === 1 ? " was" : "s were"
+          } detected with this workflow: ${workflowErrors.join(", ")}`
+        : undefined;
+
+    if (workflowErrorMessage !== undefined) {
+      core.warning(workflowErrorMessage);
+    }
+
     if (
       !(await actionsUtil.sendStatusReport(
-        await actionsUtil.createStatusReportBase("init", "starting", startedAt)
+        await actionsUtil.createStatusReportBase(
+          "init",
+          "starting",
+          startedAt,
+          workflowErrorMessage
+        )
       ))
     ) {
       return;