Add keep-warm workflow: ping veripsa.com so the free-tier web service doesn't cold-start (#4)

Author: RollNuts

.github/workflows/keep-warm.yml

@@ -0,0 +1,30 @@
+name: keep-warm
+
+# Pings veripsa.com so the Render free-tier web service does not sleep — a slept
+# service cold-starts in ~10s, which is what makes the site feel slow. This repo
+# is public, so Actions minutes are unlimited (free). GitHub's scheduled runs can
+# be delayed under load, so we ping every 5 min to stay comfortably under Render's
+# ~15 min idle-sleep threshold. Zero secrets; just an outbound GET to a health URL.
+
+on:
+  schedule:
+    - cron: "*/5 * * * *"
+  workflow_dispatch: {}
+
+permissions:
+  contents: read
+
+jobs:
+  ping:
+    runs-on: ubuntu-latest
+    timeout-minutes: 2
+    steps:
+      - name: Ping health endpoint
+        run: |
+          for attempt in 1 2 3; do
+            code=$(curl -s -o /dev/null -w "%{http_code}" --max-time 40 https://veripsa.com/api/healthz || echo "000")
+            echo "attempt $attempt: HTTP $code"
+            [ "$code" = "200" ] && exit 0
+            sleep 10
+          done
+          echo "keep-warm ping did not get 200 after 3 attempts (service may be waking)"