Add dockerfile.

.dockerignore

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+.*
+*.md
+target/
+LICENSE
+*.json

Dockerfile

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+FROM rust:slim as BUILD
+
+WORKDIR /app/
+
+COPY . .
+
+RUN --mount=type=cache,target=/usr/local/cargo/registry \
+    --mount=type=cache,target=/app/target/   \
+    cargo build --release && \
+    mv target/release/piped-proxy .
+
+FROM debian:stable-slim
+
+RUN --mount=type=cache,target=/var/cache/apt \
+    apt-get update && \
+    apt-get install -y --no-install-recommends \
+    ca-certificates && \
+    rm -rf /var/lib/apt/lists/*
+
+WORKDIR /app/
+
+COPY --from=BUILD /app/piped-proxy .
+
+EXPOSE 8080
+
+CMD ["/app/piped-proxy"]