Adds protoc-gen-prost v0.2.1 (#288)

Author: mfridman

plugins/community/neoeinstein-prost/source.yaml

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+source:
+  crates:
+    crate_name: protoc-gen-prost

plugins/community/neoeinstein-prost/v0.2.1/.dockerignore

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+*
+!Dockerfile

plugins/community/neoeinstein-prost/v0.2.1/Dockerfile

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+# syntax=docker/dockerfile:1.4
+FROM rust:1.66.0-alpine3.17 as builder
+RUN apk add --no-cache musl-dev
+WORKDIR /app
+RUN --mount=type=cache,target=/usr/local/cargo/registry --mount=type=cache,target=/root/target \
+    cargo install protoc-gen-prost --version 0.2.1 --locked --root /app
+
+FROM gcr.io/distroless/static
+COPY --from=builder /app/bin/protoc-gen-prost /protoc-gen-prost
+USER nobody
+ENTRYPOINT ["/protoc-gen-prost"]

plugins/community/neoeinstein-prost/v0.2.1/buf.plugin.yaml

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+version: v1
+name: buf.build/community/neoeinstein-prost
+plugin_version: v0.2.1
+source_url: https://crates.io/crates/protoc-gen-prost
+description: Generates code using the Prost! code generation engine.
+output_languages:
+  - rust
+spdx_license_id: Apache-2.0
+license_url: https://github.com/neoeinstein/protoc-gen-prost/blob/1daacefaef6a5627d8a33d7258f58f972a845bba/LICENSE

tests/testdata/buf.build/community/neoeinstein-prost/v0.2.1/eliza/plugin.sum

@@ -0,0 +1 @@
+h1:P+ng+Q1BRzOatMVDAU9TZH05uohslVqyi4Q6Riyq2Og=

tests/testdata/buf.build/community/neoeinstein-prost/v0.2.1/petapis/plugin.sum

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+h1:jfwgUYMNRZoehWajZoMrEC8OFpv5JfjU7IJqQf5qRzM=