ci: trigger schutzbot from github action

Previously, we had a webhook relay. It received a notification from Github
and sent it to AWS SQS. Now, the webhook is dead. The new method (already used
in osbuild-composer and image-builder) is to send the notification directly
from a github action to AWS SQS.

schutzbot/send_webhook.py

@@ -0,0 +1,32 @@
+#!/usr/bin/env python
+# Trigger a webhook event for Schutzbot using AWS SQS.
+import json
+import os
+
+import boto3
+from botocore import UNSIGNED
+from botocore.client import Config
+
+WEBHOOK_PAYLOAD = os.environ.get("WEBHOOK_PAYLOAD")
+EVENT_NAME = os.environ.get("EVENT_NAME")
+SQS_QUEUE_URL = os.environ.get("SQS_QUEUE_URL")
+SQS_REGION = os.environ.get("SQS_REGION")
+
+sqs = boto3.client(
+    'sqs',
+    region_name=SQS_REGION,
+    config=Config(
+        signature_version=UNSIGNED
+    )
+)
+
+payload = json.loads(WEBHOOK_PAYLOAD)
+message = {
+    'headers': {'X-Github-Event': EVENT_NAME},
+    'payload': payload
+}
+
+response = sqs.send_message(
+    QueueUrl=SQS_QUEUE_URL,
+    MessageBody=json.dumps(message)
+)