Set up automatic deployment to fly.io

.github/workflows/deploy.yml

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+name: Fly Deploy
+on: [push]
+env:
+  FLY_API_TOKEN: ${{ secrets.FLY_API_TOKEN }}
+jobs:
+  deploy:
+      name: Deploy app
+      runs-on: ubuntu-latest
+      steps:
+        - uses: actions/checkout@v2
+        - uses: superfly/flyctl-actions/setup-flyctl@master
+        - run: flyctl deploy --remote-only

Dockerfile

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+FROM rust:1 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 ./
+# Needs at least a main.rs file with a main function
+RUN mkdir src && echo "fn main(){}" > src/main.rs
+# Will build all dependent crates in release mode
+RUN cargo build --release
+
+# Copy the rest
+COPY . .
+# Build (install) the actual binaries
+RUN cargo install --path .
+
+# Runtime image
+FROM debian:stable-slim
+
+# 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/protocol-z-cash /app/protocol-z-cash
+
+# No CMD or ENTRYPOINT, see fly.toml with `cmd` override.

fly.toml

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+# fly.toml file generated for protocol-z-cash on 2022-04-28T10:49:01Z
+
+app = "protocol-z-cash"
+
+kill_signal = "SIGINT"
+kill_timeout = 5
+processes = []
+
+[env]
+
+[experimental]
+  allowed_public_ports = []
+  auto_rollback = true
+  cmd = "./protocol-z-cash"
+
+[[services]]
+  http_checks = []
+  internal_port = 3000
+  processes = ["app"]
+  protocol = "tcp"
+  script_checks = []
+
+  [services.concurrency]
+    hard_limit = 25
+    soft_limit = 20
+    type = "connections"
+
+  [[services.ports]]
+    force_https = true
+    handlers = ["http"]
+    port = 80
+
+  [[services.ports]]
+    handlers = ["tls", "http"]
+    port = 443
+
+  [[services.tcp_checks]]
+    grace_period = "1s"
+    interval = "15s"
+    restart_limit = 0
+    timeout = "2s"