feat: replace custom update-tools workflow with Renovate

Replace the hand-rolled update-tools.yaml GitHub Actions workflow with
a Renovate configuration. Renovate handles version updates for all tools
(Runner, Argo, Kargo, pack, dive, hadolint, yq) across both Containerfile
and manifest.yaml via regex custom managers. It also natively handles
GitHub Actions and pre-commit hook updates.

https://claude.ai/code/session_01RofXXAMZxK4irobNYjYn3W

Author: claude

.github/workflows/update-tools.yaml

@@ -0,0 +1,71 @@
+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "extends": [
+    "config:recommended"
+  ],
+  "customManagers": [
+    {
+      "customType": "regex",
+      "description": "Update GitHub Actions Runner version",
+      "fileMatch": ["^Containerfile$", "^manifest\\.yaml$"],
+      "matchStrings": ["RUNNER_VERSION=(?<currentValue>\\S+)"],
+      "depNameTemplate": "actions/runner",
+      "datasourceTemplate": "github-releases",
+      "extractVersionTemplate": "^v?(?<version>.+)$"
+    },
+    {
+      "customType": "regex",
+      "description": "Update Dive version",
+      "fileMatch": ["^Containerfile$", "^manifest\\.yaml$"],
+      "matchStrings": ["DIVE_VERSION=(?<currentValue>\\S+)"],
+      "depNameTemplate": "wagoodman/dive",
+      "datasourceTemplate": "github-releases",
+      "extractVersionTemplate": "^v?(?<version>.+)$"
+    },
+    {
+      "customType": "regex",
+      "description": "Update Hadolint version",
+      "fileMatch": ["^Containerfile$", "^manifest\\.yaml$"],
+      "matchStrings": ["HADOLINT_VERSION=(?<currentValue>\\S+)"],
+      "depNameTemplate": "hadolint/hadolint",
+      "datasourceTemplate": "github-releases",
+      "extractVersionTemplate": "^v?(?<version>.+)$"
+    },
+    {
+      "customType": "regex",
+      "description": "Update yq version",
+      "fileMatch": ["^Containerfile$", "^manifest\\.yaml$"],
+      "matchStrings": ["YQ_VERSION=(?<currentValue>\\S+)"],
+      "depNameTemplate": "mikefarah/yq",
+      "datasourceTemplate": "github-releases",
+      "extractVersionTemplate": "^v?(?<version>.+)$"
+    },
+    {
+      "customType": "regex",
+      "description": "Update Argo Workflows CLI version",
+      "fileMatch": ["^Containerfile$", "^manifest\\.yaml$"],
+      "matchStrings": ["ARGO_VERSION=(?<currentValue>\\S+)"],
+      "depNameTemplate": "argoproj/argo-workflows",
+      "datasourceTemplate": "github-releases",
+      "extractVersionTemplate": "^v?(?<version>.+)$"
+    },
+    {
+      "customType": "regex",
+      "description": "Update Kargo CLI version",
+      "fileMatch": ["^Containerfile$", "^manifest\\.yaml$"],
+      "matchStrings": ["KARGO_VERSION=(?<currentValue>\\S+)"],
+      "depNameTemplate": "akuity/kargo",
+      "datasourceTemplate": "github-releases",
+      "extractVersionTemplate": "^v?(?<version>.+)$"
+    },
+    {
+      "customType": "regex",
+      "description": "Update pack (Buildpacks) CLI version",
+      "fileMatch": ["^Containerfile$", "^manifest\\.yaml$"],
+      "matchStrings": ["PACK_VERSION=(?<currentValue>\\S+)"],
+      "depNameTemplate": "buildpacks/pack",
+      "datasourceTemplate": "github-releases",
+      "extractVersionTemplate": "^v?(?<version>.+)$"
+    }
+  ]
+}