Run certificate check weekly

.gitea/workflows/certificates.yaml

@@ -1,19 +1,19 @@
-name: Build certificates
-
+name: "Build certificates"
 on:
   workflow_dispatch:
     # Note: this doesn't work on current gitea for some reason?
     build_certs:
-      description: Build certificates from scratch
-      type: boolean
+      description: "Build certificates from scratch"
+      type: "boolean"
       required: true
       default: false
+  schedule: "@weekly"
 env:
-  TZ: America/Chicago
+  TZ: "America/Chicago"
 jobs:
   deploy:
-    name: Setup/Renew certificates
-    runs-on: homelab
+    name: "Setup/Renew certificates"
+    runs-on: "homelab"
     steps:
       - name: "Build certificates"
         if: inputs.build_certs