Add instructions for synapse-compress

tools/synapse-compress-state/Dockerfile

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+# ---- Base ----
+FROM alpine AS base
+WORKDIR /app
+# Install dependencies
+RUN apk add --no-cache libgcc libssl1.1 libc6-compat
+
+# ---- Build ----
+FROM rust:alpine3.16 AS build
+WORKDIR /build
+# Install packages
+RUN apk add python3 musl-dev pkgconfig openssl-dev make
+# Set build-flags
+ENV RUSTFLAGS="-C target-feature=-crt-static"
+# Copy sources
+ADD .build/repository/ .
+# Update dependencies and Compile
+RUN cargo update && cargo build --release
+
+
+# ---- Release ----
+FROM base AS release
+# Copy build-target
+COPY --from=build /build/target/release/synapse_compress_state .
+COPY --from=build /build/target/release/synapse_auto_compressor .
+
+ENTRYPOINT ["./synapse_compress_state"]

tools/synapse-compress-state/info.env

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+GIT_REPOSITORY=https://github.com/matrix-org/rust-synapse-compress-state