revert renovate cron fix — Renovate requires wildcard minutes

Renovate doesn't support minute granularity and requires * for the
minutes field. The previous fix (7e78597) broke the config by using
a specific minute value, causing Renovate to reject the schedule (#286).

Also removes the PR check that enforced the wrong constraint.

Closes #286
Assisted-by: Claude Opus 4.6 <noreply@anthropic.com>

Author: himdel

.github/workflows/pr-checks.yml

@@ -40,13 +40,6 @@ jobs:
       - name: "Checkout metrics-service (${{ github.ref }})"
         uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
 
-      - name: "Check for wildcard cron minutes in renovate config"
-        run: |
-          if grep -Pn '"schedule".*"\* ' renovate.json; then
-            echo "::error::Cron schedules in renovate.json must not use * for minutes (runs every minute). Use a specific minute like 0."
-            exit 1
-          fi
-
       - name: "Install uv"
         uses: astral-sh/setup-uv@37802adc94f370d6bfd71619e3f0bf239e1f3b78 # v7
 

renovate.json

@@ -4,6 +4,7 @@
   "tekton": {
     "enabled": true,
     "automerge": true,
-    "schedule": ["0 */12 * * 1-5"]
+    // must use * for minutes, Renovate doesn't support minutes (#286)
+    "schedule": ["* */12 * * 1-5"]
   }
-}
+}