More scaffolding.

- Empty service (just the healthcheck).
- Docker image.
- Pre-commit.
- GitLab CI.

.dockerignore

+*
+!app.py
+!requirements.txt

.gitlab-ci.yml

+---
+include:
+  - project: shore/ci-templates
+    file: templates/pre-commit.yml
+  - project: shore/ci-templates
+    file: templates/docker.yml
+
+stages:
+  - test
+  - build
+  - deploy
+
+build:
+  extends: .docker-build-shore
+
+push:
+  extends: .docker-push

.pre-commit-config.yaml

+---
+repos:
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v3.4.0
+    hooks:
+      - id: check-executables-have-shebangs
+      - id: check-merge-conflict
+      - id: check-toml
+        files: Pipfile
+      - id: trailing-whitespace
+
+  - repo: https://github.com/Yelp/detect-secrets
+    rev: v0.14.3
+    hooks:
+      - id: detect-secrets
+
+  - repo: https://github.com/adrienverge/yamllint
+    rev: v1.25.0
+    hooks:
+      - id: yamllint
+
+  - repo: https://github.com/amperser/proselint/
+    rev: 0.10.2
+    hooks:
+      - id: proselint
+        types: [plain-text]
+        exclude: LICENSE
+
+  - repo: https://github.com/ambv/black
+    rev: 20.8b1
+    hooks:
+      - id: black
+        args:
+          - |
+              --line-length=79
+
+  - repo: https://github.com/PyCQA/prospector
+    rev: 1.3.1
+    hooks:
+      - id: prospector
+        args:
+          - |-
+            --max-line-length=79
+          - |-
+            --with-tool=pyroma
+          - |-
+            --with-tool=bandit
+          - |-
+            --without-tool=pep257
+          - |-
+            --doc-warnings
+          - |-
+            --test-warnings
+          - |-
+            --full-pep8
+          - |-
+            --strictness=high
+          - |-
+            --no-autodetect
+        additional_dependencies:
+          - bandit
+          - pyroma
+
+  - repo: https://gitlab.com/pycqa/flake8.git
+    rev: 3.8.4
+    hooks:
+      - id: flake8
+        args:
+          - |-
+            --doctests
+        additional_dependencies:
+          - flake8-bugbear
+
+  - repo: https://github.com/executablebooks/mdformat.git
+    rev: 0.5.3
+    hooks:
+      - id: mdformat
+
+  - repo: https://git.shore.co.il/nimrod/docker-pre-commit.git/
+    rev: v0.3.0
+    hooks:
+      - id: hadolint

Dockerfile

+FROM registry.hub.docker.com/library/python:3.9-alpine3.13
+WORKDIR /app
+COPY requirements.txt ./
+RUN pip install -r requirements.txt
+COPY * ./
+EXPOSE 8080
+ENV FORWARDED_ALLOW_IPS "*"
+HEALTHCHECK CMD wget --spider --quiet http://localhost:8080/ping --user-agent 'Docker Healthcheck' || exit 1
+CMD ["gunicorn", "--bind", "0.0.0.0:8080", "--log-file", "-", "--workers", "2", "app:app"]

README.md

 # Nextcloud notifier
 
+[![pipeline status](https://git.shore.co.il/nimrod/nextcloud-notifier/badges/master/pipeline.svg)](https://git.shore.co.il/nimrod/nextcloud-notifier/-/commits/master)
+
 A simple web service to push notifications to me without authentication.
 
 ## Rationale

app.py

+"""Anonymous push notification service for Nextcloud."""
+# pylint: disable=import-error
+
+import os
+import docker
+from flask import Flask
+from ruamel.yaml import YAML
+
+
+app = Flask(__name__)
+
+
+@app.route("/ping")
+def ping():
+    """Healthcheck."""
+    return "pong"

requierments.txt

+docker
+flask
+ruamel.yaml