ci: keep gitea workflows only, harden and speed up pipelines

Drop duplicated .github/workflows (helm blocks ported to .gitea deploy first). Add ci concurrency with cancel on branches, pin checkout to SHA and prettier to 3.9.8, registry layer cache for image builds. renovate-run gains config validation and dry-run input.

.gitea/workflows/deploy.yaml

@@ -130,6 +130,30 @@ jobs:
             echo "  namespaces first: ${ns_files[*]}"
             kubectl apply -f "${ns_files[@]}"
           fi
+          if [ -f "$repo/prometheus-stack/k8s/active" ]; then
+            echo "== Upgrading kube-prometheus-stack =="
+            helm upgrade --install prometheus-stack prometheus-community/kube-prometheus-stack \
+              --namespace prometheus \
+              --version 86.2.3 \
+              --values "$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: ${other_files[*]}"
             kubectl apply "${prune_opts[@]}" -f "${other_files[@]}"