Add community/roadrunner-server-php-grpc v4.5.6 (#878)

plugins/community/roadrunner-server-php-grpc/v4.5.6/.dockerignore

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+*
+!Dockerfile

plugins/community/roadrunner-server-php-grpc/v4.5.6/Dockerfile

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+# syntax=docker/dockerfile:1.6
+FROM golang:1.21.3-bullseye AS build
+RUN git clone --depth=1 --branch v4.5.6 https://github.com/roadrunner-server/grpc.git
+RUN --mount=type=cache,target=/go/pkg/mod \
+    cd grpc/protoc_plugins/protoc-gen-php-grpc && \
+    CGO_ENABLED=0 \
+    go install -ldflags="-s -w" -trimpath
+
+FROM scratch
+COPY --from=build --link --chown=root:root /etc/passwd /etc/passwd
+COPY --from=build --link --chown=root:root /go/bin/protoc-gen-php-grpc /
+USER nobody
+ENTRYPOINT [ "/protoc-gen-php-grpc" ]

plugins/community/roadrunner-server-php-grpc/v4.5.6/buf.plugin.yaml

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+version: v1
+name: buf.build/community/roadrunner-server-php-grpc
+plugin_version: v4.5.6
+source_url: https://github.com/roadrunner-server/grpc
+description: Generates code for the PHP RoadRunner application server.
+deps:
+  - plugin: buf.build/protocolbuffers/php:v24.4
+spdx_license_id: MIT
+license_url: https://github.com/roadrunner-server/grpc/blob/v4.5.6/LICENSE
+output_languages:
+  - php

tests/testdata/buf.build/community/roadrunner-server-php-grpc/v4.5.6/eliza/plugin.sum

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+h1:jT7gKL/t3iAPRsfXcC8b24F5IdSxtcuyuhD8yvmGRiA=

tests/testdata/buf.build/community/roadrunner-server-php-grpc/v4.5.6/petapis/plugin.sum

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+h1:7bA/GKq0K0btx4JnO+NSpYBkPfz0oSLjz+Ddv/NYe/A=