Add a devcontainer config, maybe? Prob garbage.

.devcontainer/Dockerfile

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+# Update the VARIANT arg in docker-compose.yml to pick an Elixir version: 1.9, 1.10, 1.10.4
+ARG VARIANT="1.17.2"
+FROM elixir:${VARIANT}
+
+# This Dockerfile adds a non-root user with sudo access. Update the “remoteUser” property in
+# devcontainer.json to use it. More info: https://aka.ms/vscode-remote/containers/non-root-user.
+ARG USERNAME=vscode
+ARG USER_UID=1000
+ARG USER_GID=$USER_UID
+
+# Options for common package install script
+ARG INSTALL_ZSH="true"
+ARG UPGRADE_PACKAGES="true"
+
+# Optional Settings for Phoenix
+ARG PHOENIX_VERSION="1.7.12"
+
+# [Optional] Setup nodejs
+ARG NODE_SCRIPT_SOURCE="https://raw.githubusercontent.com/microsoft/vscode-dev-containers/main/script-library/node-debian.sh"
+ARG NODE_SCRIPT_SHA="dev-mode"
+ARG NODE_VERSION="none"
+ENV NVM_DIR=/usr/local/share/nvm
+ENV NVM_SYMLINK_CURRENT=true
+ENV PATH=${NVM_DIR}/current/bin:${PATH}
+
+# [Optional, Choice] Node.js version: none, lts/*, 16, 14, 12, 10
+ARG NODE_VERSION="21.7.3"
+
+# Install needed packages and setup non-root user. Use a separate RUN statement to add your own dependencies.
+
+RUN su ${USERNAME} -c "mix local.hex --force \
+  && mix local.rebar --force \
+  && mix archive.install --force hex phx_new ${PHOENIX_VERSION}"
+
+# [Optional] Uncomment this section to install additional OS packages.
+RUN apt-get update \
+    && export DEBIAN_FRONTEND=noninteractive \
+    && apt-get -y install --no-install-recommends postgresql-client inotify-tools
+
+# [Optional] Uncomment this line to install additional package.
+# RUN  mix ...

.devcontainer/devcontainer.json

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+// For format details, see https://aka.ms/devcontainer.json. For config options, see the README at:
+// https://github.com/microsoft/vscode-dev-containers/tree/v0.231.5/containers/elixir-phoenix-postgres
+{
+	"name": "Elixir/Phoenix",
+	"dockerComposeFile": "docker-compose.yml",
+	"service": "elixir",
+	"workspaceFolder": "/workspace",
+
+	// Set *default* container specific settings.json values on container create.
+	"settings": {},
+
+	// Add the IDs of extensions you want installed when the container is created.
+	"extensions": [
+	],
+
+	// Use 'forwardPorts' to make a list of ports inside the container available locally.
+	// This can be used to network with other containers or with the host.
+	"forwardPorts": [4000, 4001, 5432],
+
+	// Use 'postCreateCommand' to run commands after the container is created.
+	"postCreateCommand": "mix deps.get"
+
+	// Uncomment to connect as a non-root user. See https://aka.ms/vscode-remote/containers/non-root.
+	"remoteUser": "vscode"
+}

.devcontainer/docker-compose.yml

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+version: "3.8"
+
+services:
+  elixir:
+    build:
+      context: .
+      dockerfile: Dockerfile
+      args:
+        # Elixir Version: 1.9, 1.10, 1.10.4, ...
+        VARIANT: "1.16.2"
+        # Phoenix Version: 1.4.17, 1.5.4, ...
+        PHOENIX_VERSION: "1.7.12"
+        # Node Version: 12, 14, ...
+        NODE_VERSION: "21.7.3"
+
+    volumes:
+      - ..:/workspace:cached
+    # Runs app on the same network as the database container, allows "forwardPorts" in devcontainer.json function.
+    network_mode: service:db
+
+    # Overrides default command so things don't shut down after the process ends.
+    command: sleep infinity
+
+  db:
+    image: postgres:latest
+    restart: unless-stopped
+    volumes:
+      - postgres-data:/var/lib/postgresql/data
+    environment:
+      POSTGRES_USER: postgres
+      POSTGRES_PASSWORD: postgres
+      POSTGRES_DB: todo_dev
+
+volumes:
+  postgres-data: