55 lines
1.6 KiB
Docker
55 lines
1.6 KiB
Docker
# syntax=docker/dockerfile:1.7-labs
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## Two-stage build for minimal Flutter web static server (Caddy runtime)
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# Stage 1: Build the Flutter web app
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FROM ghcr.io/cirruslabs/flutter:latest AS build
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WORKDIR /app
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# Copy pubspec first for better layer caching
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COPY pubspec.* ./
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# Use BuildKit cache for Dart pub cache
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RUN --mount=type=cache,target=/root/.pub-cache \
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flutter pub get
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# Copy the rest of the project
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COPY . .
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# Ensure no host caches leak into the container; use BuildKit caches for pub and Flutter
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RUN --mount=type=cache,target=/root/.pub-cache \
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--mount=type=cache,target=/sdks/flutter/bin/cache \
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rm -rf .dart_tool build && \
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flutter pub get && \
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flutter gen-l10n && \
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flutter build web --release -O4 --wasm
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# Stage 2: Caddy (Alpine) to serve static files with SPA fallback
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FROM caddy:2-alpine AS runtime
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WORKDIR /usr/share/caddy
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# Copy built web assets
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COPY --from=build /app/build/web/ /usr/share/caddy/
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# Write Caddyfile inline (listens on :8080 and SPA fallback)
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ENV PORT=8080
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RUN cat > /etc/caddy/Caddyfile <<'CADDY'
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{
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admin off
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}
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:{$PORT} {
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root * /usr/share/caddy
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encode zstd gzip
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# SPA fallback: serve index.html if file not found
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try_files {path} /index.html
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file_server
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}
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CADDY
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# Some platforms (e.g., gVisor/Firecracker like Render) forbid file capabilities; strip and copy to a clean path
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USER root
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RUN apk add --no-cache libcap && \
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(setcap -r /usr/bin/caddy || true) && \
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install -m 0755 /usr/bin/caddy /caddy && \
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apk del libcap
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# Use numeric UID/GID for caddy to avoid passwd lookup issues across platforms
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USER 65532:65532
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EXPOSE 8080
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ENTRYPOINT ["/caddy", "run", "--config", "/etc/caddy/Caddyfile", "--adapter", "caddyfile"]
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