Bootstrap CodePress Live Dev Server recipe + dev Dockerfile

.codepress/dev-server/Dockerfile.web

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+# Generated by CodePress bootstrap-dev-server.
+# Dev-mode image for the "web" frontend (Live Dev Server).
+# Edits are preserved, but running /codepress-bootstrap-dev-server again may overwrite them.
+FROM public.ecr.aws/docker/library/node:18-bookworm
+
+# Node 18 rather than the current LTS on purpose: web/ is Create React App
+# (react-scripts 1.0.10) pinned to webpack 2.6.1 / webpack-dev-server 2.5.0 in
+# web/yarn.lock, which does not run reliably on recent Node majors.
+
+# System packages the dev runtime needs. `procps` only: the one native dependency
+# in web/yarn.lock is `fsevents` (macOS-only, skipped on Linux), so nothing is
+# built from source here.
+RUN apt-get update \
+    && apt-get install -y --no-install-recommends procps \
+    && rm -rf /var/lib/apt/lists/*
+
+# Bake only the package-manager binary (no app dependencies) so a cold start
+# never has to fetch yarn from the registry before the dev server can boot.
+RUN corepack enable && corepack prepare yarn@1.22.22 --activate
+
+WORKDIR /app
+
+# THIN image: no node_modules, no source COPY. The dev-server runtime provides
+# dependencies at run time (squashfs hydration, or `yarn install
+# --frozen-lockfile` in this image against the bind-mounted checkout). Only the
+# toolchain lives here.
+
+# HMR + bind config — values come from the runtime, never hardcoded.
+ENV HOSTNAME=0.0.0.0 \
+    CODEPRESS_BIND_HOST=0.0.0.0 \
+    PORT=3000 \
+    CODEPRESS_HMR_CLIENT_PORT=443 \
+    CODEPRESS_HMR_PROTOCOL=wss
+
+# CRA dev-server behaviour inside a container: never try to launch a browser, and
+# accept the preview proxy's Host header.
+ENV BROWSER=none \
+    DANGEROUSLY_DISABLE_HOST_CHECK=true
+
+WORKDIR /app/web
+EXPOSE 3000
+
+# Put the checkout's bins on PATH as a backstop so anything the dev command
+# shells out to resolves node_modules/.bin. These dirs are populated at run time
+# on the bind-mounted checkout. Prepend, never replace ${PATH}, so the
+# corepack/yarn shims survive.
+ENV PATH="/app/web/node_modules/.bin:/app/node_modules/.bin:${PATH}"
+
+# Dev command (HMR on), invoked through the package manager rather than a bare
+# binary. react-scripts reads HOST and PORT from env. This CRA version derives
+# its HMR socket URL from window.location, so the websocket follows the public
+# preview origin automatically once upgrades are proxied; WDS_SOCKET_PORT /
+# WDS_SOCKET_PROTOCOL are exported for the same contract and are ignored by 1.x.
+CMD ["sh", "-c", "HOST=\"${CODEPRESS_BIND_HOST:-0.0.0.0}\" WDS_SOCKET_PORT=\"${CODEPRESS_HMR_CLIENT_PORT:-443}\" WDS_SOCKET_PROTOCOL=\"${CODEPRESS_HMR_PROTOCOL:-wss}\" yarn start"]

.codepress/dev-server/recipe.json

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+{
+  "schema_version": 1,
+  "bootstrapped_at": "2026-07-25T09:11:00Z",
+  "discovery_branch": "master",
+  "frontends": [
+    {
+      "label": "web",
+      "working_dir": "web",
+      "dockerfile_path": ".codepress/dev-server/Dockerfile.web",
+      "dev_command": "sh -c 'HOST=\"${CODEPRESS_BIND_HOST:-0.0.0.0}\" WDS_SOCKET_PORT=\"${CODEPRESS_HMR_CLIENT_PORT:-443}\" WDS_SOCKET_PROTOCOL=\"${CODEPRESS_HMR_PROTOCOL:-wss}\" yarn start'",
+      "prebuild_command": "",
+      "prebuild_inputs": [],
+      "framework": "cra",
+      "package_manager": "yarn",
+      "install_command": "yarn install --frozen-lockfile",
+      "dependency_manifests": ["web/yarn.lock"],
+      "dev_port": 3000,
+      "system_packages": ["procps"],
+      "size": "medium"
+    }
+  ]
+}