feat: switch to CodeBuild GItHub runner (#286)

Update the Upptime site check workflow to use the CodeBuild GitHub
runner.  This is being directly in the workflow rather than using the
Upptime `runner` config option since we do not want all Upptime
workflows to run on the CodeBuild runner.

.github/workflows/uptime.yml

@@ -1,12 +1,3 @@
-# This file was generated by upptime/[email protected]
-#
-# ===============================
-# Do not edit this file directly!
-# ===============================
-#
-# Your changes will be overwritten when the template updates (daily)
-# Instead, change your .upptimerc.yml configuration: https://upptime.js.org/docs
-
 name: Uptime CI
 on:
   schedule:
@@ -17,7 +8,7 @@ on:
 jobs:
   release:
     name: Check status
-    runs-on: ubuntu-latest
+    runs-on: codebuild-cds-snc-status-statut-${{ github.run_id }}-${{ github.run_attempt }}
     steps:
       - name: Checkout
         uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2