load mapping of gh id to ASF id (#40)

diff --git a/webhook-receive.py b/webhook-receive.py
index ee0ed61..f251ef3 100644
--- a/webhook-receive.py
+++ b/webhook-receive.py
@@ -1,7 +1,15 @@
 from flask import Flask, request, jsonify
+from yaml import load, dump
+from yaml import Loader, Dumper
 
 app = Flask(__name__)
 
+with open("config.yml") as fp:
+    config = load(fp, Loader=Loader)
+
+gh_user_map = config.get("gh-user-map", {})
+
+
 @app.route('/webhook', methods=['POST'])
 def webhook_receiver():
     payload = request.json
@@ -11,9 +19,10 @@
     if event == "pull_request" and action == "enqueued":
         pr_number = payload.get("number")
         login = payload.get("sender").get("login")
+        asf_id = gh_user_map.get(login)
         pull_request = payload.get("pull_request")
         title = pull_request.get("title")
-        print(f"User {login} added PR #{pr_number} ({title}) to merge queue.") 
+        print(f"User {login} (Apache ID {asf_id}) added PR #{pr_number} ({title}) to merge queue.")
     elif event == "pull_request" and action == "dequeued":
         pr_number = payload.get("number")
         reason = payload.get("reason")
@@ -22,14 +31,16 @@
             merge_commit_sha = pull_request.get("merge_commit_sha")
             title = pull_request.get("title")
             login = payload.get("sender").get("login")
-            print(f"User {login} merged PR #{pr_number} ({title}). Merge SHA is {merge_commit_sha}") 
+            asf_id = gh_user_map.get(login)
+            print(f"User {login} (Apache ID {asf_id}) merged PR #{pr_number} ({title}). Merge SHA is {merge_commit_sha}")
     elif event == "merge_group" and action == "checks_requested":
         print("Merge group!!")
         merge_group = payload.get("merge_group", {})
         login = payload.get("sender").get("login")
+        asf_id = gh_user_map.get(login)
         base = merge_group.get("base_sha")
         head = merge_group.get("head_sha")
-        print(f"User {login} merged commits after {base} up until {head} via merge queue")
+        print(f"User {login} (Apache ID {asf_id}) merged commits after {base} up until {head} via merge queue")
     else:
         print(f"Received webhook event {event} with action {action}")