run application by default in docker build

meta/build.pkr.hcl

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+# builds a container running egalaxyd
+# make sure you have the "podman" packer plugin installed, ie: `packer plugins install github.com/Polpetta/podman`
+
+source "docker" "egalaxyd" {
+  image = "elixir:1.13.4-otp-25-alpine"
+  commit = true
+  changes = [
+    "WORKDIR /root",
+    "EXPOSE 1965 3000",
+    "ENTRYPOINT /root/bin/egalaxyd start"
+  ]
+}
+
+build {
+  sources = ["source.docker.egalaxyd"]
+
+  provisioner "shell" {
+    script = "install.sh"
+  }
+
+  post-processors {
+    post-processor "docker-tag" {
+      repository = "egalaxyd"
+      tags = ["0.4.4"]
+    }
+  }
+}

meta/install.sh

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+#!/bin/sh -e
+
+# This script installs egalaxyd from source on an Alpine Linux host using default configuration options.
+# It is expected that Erlang and Elixir are already installed and available on the host.
+
+apk update
+apk upgrade
+apk add git
+
+# Change to the home directory
+cd
+
+# Clone the egalaxyd repository
+git clone --depth 1 --branch 0.4.4 https://git.sr.ht/~slondr/egalaxyd egalaxyd
+cd egalaxyd
+
+export MIX_ENV=prod
+
+# Ensure we have hex installed (to pull dependencies)
+mix local.hex --force
+
+# Install dependencies
+mix deps.get
+
+# Compile the application so it is ready to
+mix release
+
+# By default the above command will produce a runnable script in the _build directory. However, that script can be
+# unwieldy to run as it's both (a) in a deeply-nested subdirectory and (b) dependent on files from the toplevel
+# existing in the working directory. To make this less cumbersome, we extract the tarball into ~ and copy over the
+# relevant files.
+cd ~
+cp egalaxyd/_build/prod/egalaxyd-0.4.4.tar.gz ./
+gunzip egalaxyd-0.4.4.tar.gz
+tar -xf egalaxyd-0.4.4.tar
+
+# egalaxyd excepts a private key named (by default) "server.key" and a certificate named "server.crt"
+printf "TODO: Come up with a way for like, users to customize SSL settings easily\n" 1>&2
+apk add openssl
+openssl genrsa -out server.key 2048 # private key
+openssl req -new -key server.key -out server.csr -subj '/C=SU/ST=FakeLocation/CN=mydomain.example.com' # sign req
+openssl x509 -req -days 7 -in server.csr -signkey server.key -out server.crt
+
+# Copy over the default Toml configuration file from the git source. Ideally this would have been part of the
+# tarball, but that is WIP at the moment
+cp egalaxyd/geminex.toml ./