Add docker build, fly config

.dockerignore

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+/target
+/node_modules
+/test-ledger
+/config
+**/validator.log

Dockerfile

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+# syntax = docker/dockerfile:1.2
+FROM rust:1.65.0 as base
+RUN cargo install cargo-chef
+RUN rustup component add rustfmt
+RUN apt-get update && apt-get install -y clang cmake ssh
+WORKDIR /app
+
+FROM base AS plan
+COPY . .
+WORKDIR /app
+RUN cargo chef prepare --recipe-path recipe.json
+
+FROM base as build
+COPY --from=plan /app/recipe.json recipe.json
+RUN cargo chef cook --release --recipe-path recipe.json
+COPY . .
+RUN cargo build --release --bin lite-rpc
+
+FROM debian:bullseye-slim as run
+RUN apt-get update && apt-get -y install ca-certificates libc6
+COPY --from=build /app/target/release/lite-rpc /usr/local/bin/
+
+CMD "lite-rpc --rpc-url $RPC_URL --websocket-url $WS_URL"

fly.toml

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+app = "solana-lite-rpc"
+kill_signal = "SIGINT"
+kill_timeout = 5
+
+[env]
+  PORT_HTTP = "9000"
+  PORT_WS = "9001"
+
+[[services]]
+  internal_port = 9000
+  processes = ["app"]
+  protocol = "tcp"
+
+  [services.concurrency]
+    hard_limit = 1024
+    soft_limit = 1024
+    type = "connections"
+
+[[services]]
+  internal_port = 9001
+  processes = ["app"]
+  protocol = "tcp"
+
+  [services.concurrency]
+    hard_limit = 1024
+    soft_limit = 1024
+    type = "connections"
+
+[metrics]
+  path = "/metrics"
+  port = 9091