Add BCR manifest and bzlmod E2E test (#298)

I'm not really sure if this will work, it looks like we'll have to wing
it and see what happens.

.bazelignore

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+e2e/

.bcr/metadata.template.json

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+{
+  "homepage": "https://github.com/bufbuild/protovalidate",
+  "maintainers": [
+    {
+      "name": "Protovalidate Team",
+      "email": "[email protected]",
+      "github": "bcr-buf"
+    }
+  ],
+  "repository": [
+    "github:bufbuild/protovalidate"
+  ],
+  "versions": [],
+  "yanked_versions": {}
+}

.bcr/presubmit.yml

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+bcr_test_module:
+  module_path: "e2e/bzlmod"
+  matrix:
+    platform: ["debian10", "macos"]
+    bazel: [7.x, 8.x]
+  tasks:
+    run_tests:
+      name: "Run test module"
+      platform: ${{ platform }}
+      bazel: ${{ bazel }}
+      test_targets:
+        - "//..."

.bcr/source.template.json

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

e2e/bzlmod/.bazelrc

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+../../.bazelrc

e2e/bzlmod/.gitignore

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+bazel-*

e2e/bzlmod/BUILD.bazel

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+# Copyright 2023 Buf Technologies, Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+load("@rules_buf//buf:defs.bzl", "buf_lint_test")
+load("@rules_proto//proto:defs.bzl", "proto_library")
+
+proto_library(
+    name = "example_proto",
+    srcs = [
+        "example.proto",
+    ],
+    visibility = ["//visibility:public"],
+    deps = [
+        "@protovalidate//proto/protovalidate/buf/validate:validate_proto",
+    ],
+)
+
+buf_lint_test(
+    name = "example_proto_lint",
+    config = "//:buf.yaml",
+    targets = [":example_proto"],
+)

e2e/bzlmod/MODULE.bazel

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+# Copyright 2023 Buf Technologies, Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+bazel_dep(name = "protovalidate", version = "0.0.0", dev_dependency = True)
+local_path_override(
+    module_name = "protovalidate",
+    path = "../..",
+)
+
+bazel_dep(name = "rules_buf", version = "0.3.0")
+bazel_dep(name = "protobuf", version = "29.2", repo_name = "com_google_protobuf")
+bazel_dep(name = "rules_proto", version = "7.1.0")

e2e/bzlmod/buf.lock

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+# Generated by buf. DO NOT EDIT.
+version: v1
+deps:
+  - remote: buf.build
+    owner: bufbuild
+    repository: protovalidate
+    commit: a3320276596649bcad929ac829d451f4
+    digest: shake256:a6e5f64fd3fd47e3e8568e9753f59a1566f56c11ec055baf65463d3bca3499f6f16c2d6f5628fa41cfd0f4fa7e72abe65be4efd77d269749492472ed4cc4070d

e2e/bzlmod/buf.yaml

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+version: v1
+deps:
+  - buf.build/bufbuild/protovalidate
+lint:
+  use:
+    - STANDARD
+  except:
+    - DIRECTORY_SAME_PACKAGE
+    - PACKAGE_DEFINED
+    - PACKAGE_DIRECTORY_MATCH
+    - PACKAGE_SAME_DIRECTORY
+breaking:
+  use:
+    - FILE

e2e/bzlmod/example.proto

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+// Copyright 2023 Buf Technologies, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+syntax = "proto3";
+
+import "buf/validate/validate.proto";
+
+message TestMessage {
+  bool test_field = 1 [(buf.validate.field).bool.const = true];
+}