Add metadata and configuration templates for publishing to BCR

.bcr/README.md

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+# Configuration to use Publish to BCR
+
+This directory contains a set of templates required by the [publish-to-bcr](https://github.com/bazel-contrib/publish-to-bcr/tree/main) plugin, which will publish a released version of **gRPC-Gateway** as a new module in the [Bazel Central Registry](https://registry.bazel.build/).
+
+The plugin aims to eliminate a manual publishing process for the module and initiate the process when a release is created.
+
+## Publish to BCR template files
+
+The configuration consists of three files placed in the `.bcr` directory:
+
+* `.bcr/metadata.template.json`: that describes the repository and maintainers' information.
+* `.bcr/presubmit.yml`: describes the targets that will be built and tested on specific platforms and bazel versions to test the module.
+* `.bcr/source.template.json`: that will automatically substitute values for the repository, owner, and tag based on the repository and release data.
+
+_For more information regarding the files that form a BCR entry, check the following references:_
+
+* [Bazel registries](https://bazel.build/external/registry).
+* [External dependencies overview](https://bazel.build/external/overview).
+
+## Result
+
+The final result of this process is the creation of a PR in the BCR repository to publish the released version.
+
+Once these templates are populated, the `publish-to-bcr` app should be configured as described [here](https://github.com/bazel-contrib/publish-to-bcr/tree/main?tab=readme-ov-file#how-it-works).

.bcr/metadata.template.json

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+{
+  "homepage": "https://grpc-ecosystem.github.io/grpc-gateway",
+  "maintainers": [
+    {
+      "name": "Johan Brandhorst-Satzkorn",
+      "email": "[email protected]",
+      "github": "johanbrandhorst"
+    }
+  ],
+  "repository": ["github:grpc-ecosystem/grpc-gateway"],
+  "versions": [],
+  "yanked_versions": {}
+}

.bcr/presubmit.yml

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+bcr_test_module:
+  module_path: "MODULE.bazel"
+  matrix:
+    platform: ["debian10", "macos", "ubuntu2004", "windows"]
+    bazel: [6.x, 7.x, 8.x]
+  tasks:
+    run_tests:
+      name: "Build and test grpc-gateway module"
+      platform: ${{ platform }}
+      bazel: ${{ bazel }}
+      build_targets:
+        - "//..."
+      test_targets:
+        - "//..."

.bcr/source.template.json

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+{
+  "integrity": "",
+  "strip_prefix": "{REPO}-{VERSION}",
+  "url": "https://github.com/{OWNER}/{REPO}/releases/download/{TAG}/{REPO}-{TAG}.tar.gz"
+}

renovate.json

@@ -9,6 +9,18 @@
     "postUpdateOptions": [
         "gomodTidy"
     ],
+    "customManagers": [
+        {
+            "customType": "regex",
+            "fileMatch": [".bcr/presubmit.yml"],
+            "matchStrings": [
+                "bazel:\\s*\\[(?<currentValue>[0-9.x,\\s]+)\\]"
+            ],
+            "depNameTemplate": "Bazel",
+            "datasourceTemplate": "bazel",
+            "versioningTemplate": "regex:^\\d+\\.x$"
+        }
+    ],
     "packageRules": [
         {
             "updateTypes": [