feat(deployment): Add Docker and Fly.io integration

* Add a .dockerignore file to exclude unnecessary files and directories (like .git, __pycache__, .envrc, .venv, and fly.toml) from Docker builds, optimizing build context size and performance.
* Introduce a Dockerfile setting up a multi-stage build for the `pucoti` application using Python 3.12. This enhances container performance by separating dependencies installation and the runtime environment.
* Set up a GitHub Actions workflow `fly-deploy.yml` for continuous deployment to Fly.io. It triggers on pushes to the main branch and deploys the app using `flyctl`.
* Create a fly.toml file for configuring Fly.io deployments, including app settings such as region, HTTP service preferences, vm size, and processes.

.dockerignore

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+fly.toml
+.git/
+__pycache__/
+.envrc
+.venv/

.github/workflows/fly-deploy.yml

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+# See https://fly.io/docs/app-guides/continuous-deployment-with-github-actions/
+
+name: Fly Deploy
+on:
+  push:
+    branches:
+      - main
+jobs:
+  deploy:
+    name: Deploy app
+    runs-on: ubuntu-latest
+    concurrency: deploy-group    # optional: ensure only one action runs at a time
+    steps:
+      - uses: actions/checkout@v4
+      - uses: superfly/flyctl-actions/setup-flyctl@master
+      - run: flyctl deploy --remote-only
+        env:
+          FLY_API_TOKEN: ${{ secrets.FLY_API_TOKEN }}

Dockerfile

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+FROM python:3.12 AS builder
+
+ENV PYTHONUNBUFFERED=1 \
+    PYTHONDONTWRITEBYTECODE=1
+WORKDIR /app
+
+RUN pip install poetry
+RUN poetry config virtualenvs.in-project true
+COPY pyproject.toml poetry.lock ./
+RUN poetry install
+FROM python:3.12-slim
+WORKDIR /app
+COPY --from=builder /app/.venv .venv/
+COPY . .
+CMD ["/app/.venv/bin/uvicorn", "pucoti.server:app", "--host", "0.0.0.0", "--port", "8000"]

fly.toml

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+# fly.toml app configuration file generated for pucoti on 2024-09-21T19:52:26+02:00
+#
+# See https://fly.io/docs/reference/configuration/ for information about how to use this file.
+#
+
+app = 'pucoti'
+primary_region = 'cdg'
+
+[build]
+
+[http_service]
+  internal_port = 8000
+  force_https = true
+  auto_stop_machines = 'stop'
+  auto_start_machines = true
+  min_machines_running = 0
+  max_machines_running = 1
+  processes = ['app']
+
+[[vm]]
+  size = 'shared-cpu-1x'