add Dockerfile, .dockerignore, release.ex & fly.toml for deploy to fl…

…y.io #172

.dockerignore

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+assets/node_modules/
+deps/

Dockerfile

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+###
+### Fist Stage - Building the Release
+###
+FROM hexpm/elixir:1.12.1-erlang-24.0.1-alpine-3.13.3 AS build
+
+# install build dependencies
+RUN apk add --no-cache build-base npm
+
+# prepare build dir
+WORKDIR /app
+
+# extend hex timeout
+ENV HEX_HTTP_TIMEOUT=20
+
+# install hex + rebar
+RUN mix local.hex --force && \
+    mix local.rebar --force
+
+# set build ENV as prod
+ENV MIX_ENV=prod
+ENV SECRET_KEY_BASE=nokey
+
+# Copy over the mix.exs and mix.lock files to load the dependencies. If those
+# files don't change, then we don't keep re-fetching and rebuilding the deps.
+COPY mix.exs mix.lock ./
+COPY config config
+
+RUN mix deps.get --only prod && \
+    mix deps.compile
+
+# install npm dependencies
+# COPY assets/package.json assets/package-lock.json ./assets/
+# RUN npm --prefix ./assets ci --progress=false --no-audit --loglevel=error
+
+COPY priv priv
+COPY assets assets
+
+# NOTE: If using TailwindCSS, it uses a special "purge" step and that requires
+# the code in `lib` to see what is being used. Uncomment that here before
+# running the npm deploy script if that's the case.
+# COPY lib lib
+
+# build assets
+# RUN npm run --prefix ./assets deploy
+RUN mix assets.deploy
+RUN mix phx.digest
+
+# copy source here if not using TailwindCSS
+COPY lib lib
+
+# compile and build release
+COPY rel rel
+RUN mix do compile, release
+
+###
+### Second Stage - Setup the Runtime Environment
+###
+
+# prepare release docker image
+FROM alpine:3.13.3 AS app
+RUN apk add --no-cache libstdc++ openssl ncurses-libs
+
+WORKDIR /app
+
+RUN chown nobody:nobody /app
+
+USER nobody:nobody
+
+COPY --from=build --chown=nobody:nobody /app/_build/prod/rel/hits ./
+
+ENV HOME=/app
+ENV MIX_ENV=prod
+ENV SECRET_KEY_BASE=nokey
+ENV PORT=4000
+
+CMD ["bin/hits", "start"]

fly.toml

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+# fly.toml file generated
+
+app = "authprod"
+
+kill_signal = "SIGTERM"
+kill_timeout = 5
+
+[env]
+
+[deploy]
+  release_command = "/app/bin/authprod eval Auth.Release.migrate"
+
+[[services]]
+  # http_checks = []
+  internal_port = 4000
+  # processes = ["app"]
+  protocol = "tcp"
+  # script_checks = []
+
+  [services.concurrency]
+    hard_limit = 25
+    soft_limit = 20
+    # type = "connections"
+
+  [[services.ports]]
+    handlers = ["http"]
+    port = 80
+
+  [[services.ports]]
+    handlers = ["tls", "http"]
+    port = 443
+
+  [[services.tcp_checks]]
+    grace_period = "30s"
+    interval = "15s"
+    restart_limit = 6
+    timeout = "2s"

lib/auth/release.ex

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+defmodule Auth.Release do
+  @moduledoc """
+  Used for executing DB release tasks when run in production without Mix
+  installed.
+  """
+  @app :authprod
+
+  def migrate do
+    load_app()
+
+    for repo <- repos() do
+      {:ok, _, _} = Ecto.Migrator.with_repo(repo, &Ecto.Migrator.run(&1, :up, all: true))
+    end
+  end
+
+  def rollback(repo, version) do
+    load_app()
+    {:ok, _, _} = Ecto.Migrator.with_repo(repo, &Ecto.Migrator.run(&1, :down, to: version))
+  end
+
+  defp repos do
+    Application.fetch_env!(@app, :ecto_repos)
+  end
+
+  defp load_app do
+    Application.load(@app)
+  end
+end