add renovate config

renovate.json5

@@ -0,0 +1,103 @@
+{
+  // schedule: [
+  //  'before 5am on the first day of the month',
+  //],
+  semanticCommits: 'enabled',
+  configMigration: true,
+  dependencyDashboard: true,
+  regexManagers: [
+    {
+      customType: 'regex',
+      fileMatch: [
+        '^rust-toolchain\\.toml$',
+        'Cargo.toml$',
+        'clippy.toml$',
+        '\\.clippy.toml$',
+        '^\\.github/workflows/ci.yml$',
+        '^\\.github/workflows/rust-next.yml$',
+      ],
+      matchStrings: [
+        'MSRV.*?(?<currentValue>\\d+\\.\\d+(\\.\\d+)?)',
+        '(?<currentValue>\\d+\\.\\d+(\\.\\d+)?).*?MSRV',
+      ],
+      depNameTemplate: 'rust',
+      packageNameTemplate: 'rust-lang/rust',
+      datasourceTemplate: 'github-releases',
+    },
+  ],
+  packageRules: [
+    {
+      commitMessageTopic: 'MSRV',
+      matchManagers: [
+        'regex',
+      ],
+      matchPackageNames: [
+        'rust',
+      ],
+      minimumReleaseAge: '252 days', // 6 releases * 6 weeks per release * 7 days per week
+      internalChecksFilter: 'strict',
+    },
+    // Goals:
+    // - Keep version reqs low, ignoring compatible normal/build dependencies
+    // - Take advantage of latest dev-dependencies
+    // - Rollup safe upgrades to reduce CI runner load
+    // - Help keep number of versions down by always using latest breaking change
+    // - Have lockfile and manifest in-sync
+    {
+      matchManagers: [
+        'cargo',
+      ],
+      matchDepTypes: [
+        'build-dependencies',
+        'dependencies',
+      ],
+      matchCurrentVersion: '>=0.1.0',
+      matchUpdateTypes: [
+        'patch',
+      ],
+      enabled: false,
+    },
+    {
+      matchManagers: [
+        'cargo',
+      ],
+      matchDepTypes: [
+        'build-dependencies',
+        'dependencies',
+      ],
+      matchCurrentVersion: '>=1.0.0',
+      matchUpdateTypes: [
+        'minor',
+      ],
+      enabled: false,
+    },
+    {
+      matchManagers: [
+        'cargo',
+      ],
+      matchDepTypes: [
+        'dev-dependencies',
+      ],
+      matchCurrentVersion: '>=0.1.0',
+      matchUpdateTypes: [
+        'patch',
+      ],
+      automerge: true,
+      groupName: 'compatible (dev)',
+    },
+    {
+      matchManagers: [
+        'cargo',
+      ],
+      matchDepTypes: [
+        'dev-dependencies',
+      ],
+      matchCurrentVersion: '>=1.0.0',
+      matchUpdateTypes: [
+        'minor',
+      ],
+      automerge: true,
+      groupName: 'compatible (dev)',
+    },
+  ],
+}