Add protocolbuffers/dart v21.1.2 (#856)

plugins/protocolbuffers/dart/v21.1.2/.dockerignore

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+*
+!Dockerfile

plugins/protocolbuffers/dart/v21.1.2/Dockerfile

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+# syntax=docker/dockerfile:1.6
+FROM dart:2.19.6-sdk AS build
+
+WORKDIR /build
+RUN curl -fsSL https://pub.dartlang.org/packages/protoc_plugin/versions/21.1.2.tar.gz --compressed -o protoc_plugin.tar.gz \
+ && tar -xvf protoc_plugin.tar.gz \
+ && dart pub get \
+ && dart compile exe bin/protoc_plugin.dart -o protoc-gen-dart
+
+FROM scratch
+COPY --from=build --link /etc/passwd /etc/passwd
+COPY --from=build --link /runtime/ /
+COPY --from=build --link /build/protoc-gen-dart .
+USER nobody
+ENTRYPOINT [ "/protoc-gen-dart" ]

plugins/protocolbuffers/dart/v21.1.2/buf.plugin.yaml

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+version: v1
+name: buf.build/protocolbuffers/dart
+plugin_version: v21.1.2
+source_url: https://github.com/google/protobuf.dart
+description: Base types for Dart. Generates message and enum types.
+output_languages:
+  - dart
+spdx_license_id: BSD-3-Clause
+license_url: https://github.com/google/protobuf.dart/blob/protoc_plugin-v21.1.2/LICENSE

tests/testdata/buf.build/protocolbuffers/dart/v21.1.2/eliza/plugin.sum

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+h1:CldRXfthaTx233/KeLljyWMOrItmNABxwWU3d8H9+xM=

tests/testdata/buf.build/protocolbuffers/dart/v21.1.2/petapis/plugin.sum

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+h1:j0UgqeFkuxLnrP0VMawXHodV1MIfnmE57XHv1H3nfJE=