Add Dockerfile

.github/workflows/testing.yml

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+name: testing
+
+on:
+  push:
+    branches: main
+  pull_request:
+
+concurrency:
+  group: ${{ github.ref }}-${{ github.workflow }}
+  cancel-in-progress: true
+
+permissions: read-all
+
+jobs:
+  docker:
+    runs-on: ubuntu-26.04
+
+    steps:
+      - uses: actions/checkout@v7
+
+      - name: Docker version info
+        run: |
+          docker --version
+
+          docker compose --version
+
+      - name: Build kiwitcms/postgres
+        run: |
+          docker build -t kiwitcms/postgres .
+
+          docker images --digests

.pre-commit-config.yaml

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+# See https://pre-commit.com for more information
+# See https://pre-commit.com/hooks.html for more hooks
+repos:
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v6.0.0
+    hooks:
+      - id: end-of-file-fixer
+      - id: mixed-line-ending
+        args: [--fix=lf]
+      - id: trailing-whitespace

Dockerfile

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+FROM postgres:17@sha256:e38411452a464af89e5adadb8d223bf53b898d47d6ef918b2d58c08707350449
+
+ENV DEBIAN_FRONTEND=noninteractive
+
+RUN apt-get update \
+    && apt-get install -y --no-install-recommends ca-certificates curl gnupg \
+    && curl -sSL https://keys.datadoghq.com/DATADOG_APT_KEY_CURRENT.public | gpg --dearmor --output /usr/share/keyrings/datadog-archive-keyring.gpg \
+    && echo "deb [signed-by=/usr/share/keyrings/datadog-archive-keyring.gpg] https://apt.datadoghq.com/ stable 7" > /etc/apt/sources.list.d/datadog.list \
+    && apt-get update \
+    && apt-get install -y --no-install-recommends datadog-agent datadog-signing-keys \
+    && rm -rf /var/lib/apt/lists/*
+
+# Entrypoint: start agent, then your app
+#CMD service datadog-agent start && exec ./start-my-app.sh