Configure Renovate (#298)

* Configure Renovate 

https://docs.renovatebot.com/

* Rename .github/workflows/renovate.json5 to .github/renovate.json5

.github/renovate.json5

@@ -0,0 +1,123 @@
+{
+  platform: "github",
+  masterIssue: true,
+  baseBranches: [
+    "master"
+  ],
+  extends: [
+    // A lot of default settings that you can extend can be found in the presets section: https://docs.renovatebot.com/presets-compatibility/
+    ":ignoreModulesAndTests"
+  ],
+  enabledManagers: [
+    // Since we only update proprietry files (e.g variables.sh)we should use 'regex' here (see the matchManagers in the packageRules section below)
+    // If you need more, see https://docs.renovatebot.com/modules/manager/
+    "regex"
+  ],
+  regexManagers: [
+    {
+      fileMatch: [
+        "variables.sh$"
+      ],
+      matchStrings: [
+        // named capturing group, must include 'currentValue' as the name
+        "GRPC_VERSION=\\$\\{GRPC_VERSION:-(?<currentValue>.*?)\\}\\n"
+      ],
+      // the name of the dependency in the package manager
+      depNameTemplate: "grpc/grpc",
+      // which package manager should Renovate Bot look to find this dependency?
+      datasourceTemplate: "github-releases",
+      // since we only keep the version up to minor and we do not use the v prefix, we need to extract major.minor from the fetched new version
+      extractVersionTemplate: "^v(?<version>\\d+\\.\\d+)\\.\\d+",
+      // by default versioningTemplate is semvar, but since we have the v prefix, we need to use a regex to specify the type of the version.
+      versioningTemplate: "regex:^(?<major>\\d+)\\.(?<minor>\\d+)$",
+    },
+    {
+      fileMatch: [
+        "variables.sh$"
+      ],
+      matchStrings: [
+        "GRPC_JAVA_VERSION=\\$\\{GRPC_JAVA_VERSION:-(?<currentValue>.*?)\\}\\n"
+      ],
+      depNameTemplate: "grpc/grpc-java",
+      datasourceTemplate: "github-releases",
+      extractVersionTemplate: "^v(?<version>\\d+\\.\\d+)\\.\\d+",
+      versioningTemplate: "regex:^(?<major>\\d+)\\.(?<minor>\\d+)$",
+    },
+    {
+      fileMatch: [
+        "gwy/templates/go.mod.tmpl$"
+      ],
+      matchStrings: [
+        "google.golang.org/grpc\\s+(?<currentValue>.*?)\\n+"
+      ],
+      depNameTemplate: "grpc/grpc-go",
+      datasourceTemplate: "github-releases",
+      versioningTemplate: "regex:^v(?<major>\\d+)\\.(?<minor>\\d+)\\.(?<patch>\\d+)$",
+    },
+    {
+      fileMatch: [
+        "variables.sh$"
+      ],
+      matchStrings: [
+        // notice we update the same version in two locations perhaps we don't need two separate variables?)
+        "GRPC_WEB_VERSION=\\$\\{GRPC_WEB_VERSION:-(?<currentValue>.*?)\\}\\n",
+        "NODE_PROTOC_GEN_GRPC_WEB_VERSION=\\$\\{NODE_PROTOC_GEN_GRPC_WEB_VERSION:-(?<currentValue>.*?)\\}\\n"
+      ],
+      depNameTemplate: "grpc-web",
+      datasourceTemplate: "npm"
+    },
+    {
+      fileMatch: [
+        "variables.sh$"
+      ],
+      matchStrings: [
+        "GO_ENVOYPROXY_PGV_VERSION=\\$\\{GO_ENVOYPROXY_PGV_VERSION:-(?<currentValue>.*?)\\}\\n"
+      ],
+      depNameTemplate: "envoyproxy/protoc-gen-validate",
+      datasourceTemplate: "github-releases",
+      extractVersionTemplate: "^v(?<version>\\d+\\.\\d+\\.\\d+)"
+    },
+  ],
+  packageRules: [
+    // here you can define how dependency updates should be grouped in one or multiple PRs:
+    // The following means that any major or minor updates to the specified packages will be grouped in one PR,
+    // and we would like to cut a new major release for our docker image, e.g 1.42_X => 1.46_0
+    {
+      matchPackageNames: ["grpc/grpc", "grpc/grpc-java", "grpc/grpc-go"],
+      groupName: "gRPC Version",
+      matchUpdateTypes: [
+        "minor",
+        "major"
+      ],
+      groupSlug: "gRPC Major Upgrade"
+    },
+    // specifically for grpc-go, a patch version upgrade should be grouped with other misc dependencies, which you can find below.
+    // This would most likely mean we want to bump the docker image version without bumping the gRPC version, e.g 1.42_0 => 1.42_1
+    {
+      matchPackageNames: ["grpc/grpc-go"],
+      matchUpdateTypes: [
+        "patch"
+      ],
+      groupName: "Misc Non-major dependencies",
+      groupSlug: "patch-dependencies"
+    },
+    // 
+    {
+      matchPackageNames: ["grpc-web", "envoyproxy/protoc-gen-validate"],
+      matchUpdateTypes: [
+        "minor",
+        "patch"
+      ],
+      groupName: "Misc Non-major dependencies",
+      groupSlug: "minor-dependencies"
+    },
+    {
+      matchPackageNames: ["grpc-web", "envoyproxy/protoc-gen-validate"],
+      matchUpdateTypes: [
+        "major"
+      ],
+      groupName: "Misc Major Dependencies",
+      groupSlug: "major-dependencies"
+    },
+  ]
+}