Dockerfile

# ---- builder: build Java -> JavaScript using gradle wrapper (TeaVM) ----
FROM openjdk:21-jdk-slim AS builder
WORKDIR /src

# 必要ツールを入れる
RUN apt-get update && \
    apt-get install -y --no-install-recommends bash ca-certificates git wget unzip && \
    rm -rf /var/lib/apt/lists/*
    
ENV JAVA_TOOL_OPTIONS="--enable-preview"

# ソースをコンテナにコピー
COPY . /src

# gradlew を実行可能にして、JavaScript を生成する gradle タスクを実行
RUN chmod +x ./gradlew && \
    ./gradlew generateJavaScript -x test --no-daemon

# ---- runtime: nginx serve built javascript ----
FROM nginx:stable-alpine AS runtime

# ビルド成果物（javascriptフォルダ）を nginx のドキュメントルートへコピー
COPY --from=builder /src/javascript /usr/share/nginx/html

EXPOSE 80
CMD ["nginx", "-g", "daemon off;"]