v0.34.0: containerize for per-PR preview environments (flotilla SPEC §15)

2026-06-01 06:51:22 -07:00
parent 97ba3ae9b5
commit 0252e40527
9 changed files with 292 additions and 2 deletions
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+# rfc-app container image — the Cloud Run keystone for per-PR preview
+# environments (flotilla SPEC §15). NOT used by production: prod still deploys
+# via the pin-based on-VM gesture (flotilla §8). This image exists so flotilla
+# `preview up --pr=N` can build a PR's tree and run it as an ephemeral,
+# scale-to-zero Cloud Run service with a SEEDED SYNTHETIC database and ZERO real
+# secrets (test-secret env only — flotilla §15 / §3 invariant 1).
+#
+# Single container, single port: nginx serves the built SPA on $PORT (Cloud Run
+# injects it) and reverse-proxies /api/ + /auth/ to a single-process uvicorn on
+# 127.0.0.1:8000 — mirroring the prod nginx + systemd split
+# (deploy/nginx/ohm.wiggleverse.org.conf, deploy/systemd/rfc-app.service), so a
+# preview behaves like prod minus the secrets. Single uvicorn process + single
+# SQLite file, per §4.2 (never scale workers).
+#
+# Build context is the repo root:  docker build -t <image> .
+
+# ---- stage 1: build the Vite SPA -------------------------------------------
+FROM node:20-slim AS web
+WORKDIR /app/frontend
+COPY frontend/package.json frontend/package-lock.json ./
+RUN npm ci
+COPY frontend/ ./
+# VITE_* values are baked into the bundle at build time (intentionally public —
+# §8 phase-5 note). VITE_APP_NAME is REQUIRED by vite.config.js (the framework
+# ships no default — each deployment names itself); previews self-name. Turnstile
+# uses Cloudflare's always-pass test SITE key so the widget renders + auto-passes.
+ARG VITE_APP_NAME="RFC App (preview)"
+ARG VITE_TURNSTILE_SITE_KEY=1x00000000000000000000AA
+ARG VITE_AMPLITUDE_API_KEY=
+RUN VITE_APP_NAME="$VITE_APP_NAME" \
+    VITE_TURNSTILE_SITE_KEY="$VITE_TURNSTILE_SITE_KEY" \
+    VITE_AMPLITUDE_API_KEY="$VITE_AMPLITUDE_API_KEY" \
+    npm run build
+
+# ---- stage 2: runtime (backend + nginx) ------------------------------------
+FROM python:3.12-slim AS runtime
+RUN apt-get update \
+    && apt-get install -y --no-install-recommends nginx gettext-base sqlite3 \
+    && rm -rf /var/lib/apt/lists/*
+
+WORKDIR /opt/rfc-app
+
+# Backend deps first for layer caching.
+COPY backend/requirements.txt backend/requirements.txt
+RUN pip install --no-cache-dir -r backend/requirements.txt
+
+COPY backend/ backend/
+COPY deploy/preview/ deploy/preview/
+# health.py reads VERSION at parents[2] (== /opt/rfc-app/VERSION).
+COPY VERSION ./
+COPY --from=web /app/frontend/dist/ frontend/dist/
+
+RUN chmod +x deploy/preview/entrypoint.sh
+
+# Cloud Run injects $PORT (default 8080); the entrypoint renders nginx against
+# it. The synthetic preview DB lives on the container's ephemeral filesystem and
+# dies with the instance (zero create/seed/drop lifecycle — §15).
+ENV PORT=8080 \
+    DATABASE_PATH=/opt/rfc-app/backend/data/rfc-app.db
+EXPOSE 8080
+
+ENTRYPOINT ["deploy/preview/entrypoint.sh"]