Add comments to codeql-analysis.yml

Add comments for cron and make it run on Sunday mornings.

.github/workflows/codeql-analysis.yml

@@ -5,12 +5,18 @@ permissions: {}
 
 on:
   push:
-    branches: [ master ]
+    branches: [ main, master ]
   pull_request:
     # The branches below must be a subset of the branches above
-    branches: [ master ]
+    branches: [ main, master ]
   schedule:
-    - cron: '30 5 * * 4'
+    - cron: '30 14 * * 0'
+      #       |  | | | |
+      #       |  | | | day of the week (0–6 with 0=Sunday) 
+      #       |  | | month (1–12)
+      #       |  | day of month (1–31)
+      #       | hour (0–23 in UTC)
+      #       minute (0–59)
 
 concurrency:
   group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.run_id }}
@@ -40,6 +46,8 @@ jobs:
       with:
         languages: ${{ matrix.language }}
 
+    # Don't need setup-go because default version of Go is updated regularly in ubuntu-latest.
+
     # Autobuild attempts to build any compiled languages  (C/C++, C#, or Java).
     # If this step fails, then you should remove it and run the build manually (see below)
     - name: Autobuild