Adding simple Docker setup

{{cookiecutter.project_slug}}/.dockerignore

@@ -0,0 +1,14 @@
+./tests
+./scripts
+.ruff_cache
+.coveragerc
+.dockerignore
+.git
+.gitignore
+.pre-commit-config.yaml
+dev-requirements.in
+dev-requirements.txt
+.profile
+Dockerfile
+requirements.in
+tasks.py

{{cookiecutter.project_slug}}/.drone.yml

@@ -20,3 +20,26 @@ trigger:
 # Secrets used to pull private images
 image_pull_secrets:
   - dockerconfigjson
+
+---
+kind: pipeline
+type: docker
+name: Build Production Image
+steps:
+- name: Build {{ cookiecutter.project_slug }} Container Image
+  image: plugins/docker
+  settings:
+    username: automate
+    password:
+      from_secret: automate_password
+    dockerfile: Dockerfile
+    registry: registry.runcible.io
+    repo: registry.runcible.io/{{ cookiecutter.project_slug }}
+    tags:
+      - ${DRONE_COMMIT_SHA}
+  when:
+    branch:
+      - master
+    event:
+      - push
+---

{{cookiecutter.project_slug}}/Dockerfile

@@ -0,0 +1,55 @@
+# syntax = docker/dockerfile:1.4
+
+# Best practice: Choose a stable base image and tag.
+FROM python:3.11-slim-bookworm
+
+# Install security updates, and some useful packages.
+#
+# Best practices:
+# * Make sure apt-get doesn't run in interactive mode.
+# * Update system packages.
+# * Pre-install some useful tools.
+# * Minimize system package installation.
+RUN export DEBIAN_FRONTEND=noninteractive && \
+    apt-get update && \
+    apt-get -y upgrade && \
+    apt-get install -y --no-install-recommends tini procps net-tools && \
+    apt-get -y clean && \
+    rm -rf /var/lib/apt/lists/*
+
+# Install dependencies.
+#
+# Best practices:
+# * `COPY` in files only when needed.
+# * Reduce disk usage from `pip` installs.
+COPY requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+# Create a new user to run as.
+#
+# Best practices: Don't run as root.
+RUN useradd --create-home appuser
+USER appuser
+WORKDIR /home/appuser
+
+# Copy in the code.
+#
+# Best practices: Avoid extra chowns.
+COPY --chown=appuser . .
+
+# Best practices: Prepare for C crashes.
+ENV PYTHONFAULTHANDLER=1
+ENV PYTHONUNBUFFERED=0
+
+ARG COMMIT_SHA
+
+LABEL io.runcible.repo-sha="${COMMIT_SHA}"
+
+# Run the code when the image is run:
+#
+# Best practices:
+# * Add an `init` process.
+# * Make sure images shut down correctly (via ENTRYPOINT [] syntax).
+# * '-g' option means killing the container kills all processes, not just the
+#   entrypoint shell.
+ENTRYPOINT ["tini", "-g", "--", "./entrypoint.sh"]

{{cookiecutter.project_slug}}/entrypoint.sh

@@ -0,0 +1,8 @@
+#!/bin/bash
+
+# Best practice: Bash strict mode.
+set -euo pipefail
+
+# Best practice: Make sure the image shuts down correctly by using `exec` in
+# entry point shell scripts.
+exec "$@"

{{cookiecutter.project_slug}}/tasks.py

@@ -1,5 +1,8 @@
+import os
 from invoke import task
 
+IMAGE_RESPOSITORY = os.environ.get("IMAGE_RESPOSITORY", "registry.runcible.io/{{ cookiecutter.project_slug }}")
+
 
 @task
 def update_deps(c):
@@ -31,3 +34,18 @@ def delint(c):
 def build(c):
     """Builds the project as a Python package."""
     c.run("python3 -m build")
+
+
+@task
+def build_image(c, dev=True, registry_user=None, registry_token=None, push=False, login=False):
+    """Builds the {{ cookiecutter.project_slug }} container image."""
+    context_dir = c.run("pwd", hide=True).stdout.strip()
+    commit_sha = c.run("git rev-parse --short HEAD", hide=True).stdout.strip()
+    image_name = f"{IMAGE_RESPOSITORY}:{commit_sha}{'-dev' if dev else ''}"
+    c.run(f"docker build --build-arg='COMMIT_SHA={commit_sha}' -t {image_name} {context_dir}")
+    if login:
+        if registry_user is None or registry_token is None:
+            raise ValueError("--registry_user and --registry_token must be provided if using --login parameter")
+        c.run(f"docker login -u {registry_user} -p {registry_token}")
+    if push:
+        c.run(f"docker push {image_name}")