feat: add health check/ping endpoint (#95)

Author: jakebolam

serverless.yml

@@ -56,6 +56,17 @@ functions:
           path: /probot/stats
           method: get
           cors: true
+  healthCheck:
+    handler: src/serverless-health-check.handler
+    events:
+      - http:
+          path: /ping
+          method: get
+          cors: true
+      - http:
+          path: /health-check
+          method: get
+          cors: true
 
    # Tasks
   processIssueComment:

src/serverless-health-check.js

@@ -0,0 +1,7 @@
+module.exports.handler = async (event, context) => { // eslint-disable-line
+    // TODO: add real health check
+    return {
+        statusCode: 200,
+        body: 'Service is healthy',
+    }
+}