Update supporters (#327)

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

supporters.json

@@ -35,6 +35,18 @@
     "type": "Company",
     "pledge": "Development; open-source community efforts"
   },
+  {
+    "name": "Buildkite",
+    "url": "https://buildkite.com/",
+    "type": "Company",
+    "pledge": "RPM/DEB Package hosting via Packagecloud"
+  },
+  {
+    "name": "Cloudflare",
+    "url": "https://cloudflare.com/",
+    "type": "Company",
+    "pledge": "Hosting and additional services"
+  },
   {
     "name": "Massdriver",
     "url": "https://massdriver.cloud",