chore(ci): deploy loki alloy and track helm values in renovate

Deploy hook installs loki 7.3.0 and alloy 1.12.1 when loki/k8s/active exists. Renovate watches k8s values files.

.github/workflows/deploy.yaml

@@ -138,6 +138,21 @@ jobs:
               --values "$repo/prometheus-stack/k8s/grafana-values.yaml" \
               --wait
           fi
+          if [ -f "$repo/loki/k8s/active" ]; then
+            echo "== Upgrading loki/alloy =="
+            helm repo add grafana https://grafana.github.io/helm-charts >/dev/null 2>&1 || true
+            helm repo update grafana >/dev/null 2>&1 || true
+            helm upgrade --install loki grafana/loki \
+              --version 7.3.0 \
+              --namespace prometheus \
+              --values "$repo/loki/k8s/loki-values.yaml" \
+              --wait
+            helm upgrade --install alloy grafana/alloy \
+              --version 1.12.1 \
+              --namespace prometheus \
+              --values "$repo/loki/k8s/alloy-values.yaml" \
+              --wait
+          fi
 
           if [ "${#other_files[@]}" -gt 0 ]; then
             echo "  resources: ${other_files[*]}"