Fly.io (#49)

Adds support for deploying the `moq-quinn` relay server to fly.io

.dockerignore

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+media/*.mp4
+target/*
+cert/*

Dockerfile

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+FROM rust:latest as builder
+
+# Make a fake Rust app to keep a cached layer of compiled crates
+RUN USER=root cargo new app
+WORKDIR /usr/src/app
+COPY Cargo.toml Cargo.lock ./
+
+RUN mkdir -p moq-transport/src moq-quinn/src moq-warp/src moq-pub/src
+COPY moq-transport/Cargo.toml moq-transport/Cargo.toml
+COPY moq-quinn/Cargo.toml moq-quinn/Cargo.toml
+COPY moq-pub/Cargo.toml moq-pub/Cargo.toml
+COPY moq-warp/Cargo.toml moq-warp/Cargo.toml
+RUN touch moq-transport/src/lib.rs
+RUN touch moq-warp/src/lib.rs
+RUN touch moq-pub/src/lib.rs
+RUN touch moq-quinn/src/lib.rs
+
+RUN sed -i '/default-run.*/d' moq-quinn/Cargo.toml
+
+# Will build all dependent crates in release mode
+RUN --mount=type=cache,target=/usr/local/cargo/registry \
+    --mount=type=cache,target=/usr/src/app/target \
+    cargo build --release
+
+# Copy the rest
+COPY . .
+
+# Build (install) the actual binaries
+RUN cargo install --path moq-quinn
+
+# Runtime image
+FROM rust:latest
+
+# Run as "app" user
+RUN useradd -ms /bin/bash app
+
+USER app
+WORKDIR /app
+
+# Get compiled binaries from builder's cargo install directory
+COPY --from=builder /usr/local/cargo/bin/moq-quinn /app/moq-quinn
+
+ADD entrypoint.sh .
+# No CMD or ENTRYPOINT, see fly.toml with `cmd` override.

entrypoint.sh

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+#!/usr/bin/env sh
+
+mkdir cert
+# Nothing to see here...
+echo "$MOQ_CRT" | base64 -d > cert/moq-demo.crt
+echo "$MOQ_KEY" | base64 -d > cert/moq-demo.key
+
+RUST_LOG=info ./moq-quinn --cert cert/moq-demo.crt --key cert/moq-demo.key

fly.toml

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+app = "englishm-moq-relay"
+kill_signal = "SIGINT"
+kill_timeout = 5
+
+[env]
+  PORT = "4443"
+
+[experimental]
+  cmd = "./entrypoint.sh"
+
+[[services]]
+  internal_port = 4443
+  protocol = "udp"
+  [services.concurrency]
+    hard_limit = 25
+    soft_limit = 20
+
+  [[services.ports]]
+    port = "4443"