chore: import upstream snapshot with attribution

showcase/integrations/spring-ai/Dockerfile

@@ -0,0 +1,97 @@
+# Stage 1: Build AG-UI Java SDK + Spring Boot agent backend
+# Align on Temurin 21 (tracks the starter Dockerfile) — matches the
+# spring-ai community artifacts + SDK source in ag-ui-protocol/ag-ui.
+FROM maven:3-eclipse-temurin-21 AS java-builder
+RUN apt-get update && apt-get install -y --no-install-recommends git && rm -rf /var/lib/apt/lists/*
+
+# AG-UI community artifacts aren't on Maven Central yet — build from source
+WORKDIR /build
+COPY pom.xml ./
+# Single source of truth for the AG-UI commit (shared with the
+# `.github/workflows/test_unit-spring-ai.yml` workflow). Bump by editing
+# the file; both CI and this image rebuild against the new SHA.
+COPY .ag-ui-sha /tmp/.ag-ui-sha
+ENV GIT_LFS_SKIP_SMUDGE=1
+RUN AG_UI_SHA="$(tr -d '[:space:]' < /tmp/.ag-ui-sha)" && \
+    if [ -z "${AG_UI_SHA}" ]; then echo "ERROR: .ag-ui-sha is empty" >&2; exit 1; fi && \
+    git clone --no-checkout https://github.com/ag-ui-protocol/ag-ui.git /ag-ui && \
+    # `git clone` only fetches the default branch by default — if AG_UI_SHA
+    # points at a commit on a PR branch or older history not reachable from
+    # HEAD, the subsequent `checkout` fails with a cryptic "reference is not
+    # a tree". Explicitly fetch the SHA first so checkout is always against
+    # a known-local commit (R7-A2). `--depth 1` keeps the image lean.
+    git -C /ag-ui fetch --depth 1 origin "${AG_UI_SHA}" && \
+    git -C /ag-ui checkout "${AG_UI_SHA}" && \
+    cd /ag-ui/sdks/community/java && \
+    mvn install \
+        -pl servers/spring,integrations/spring-ai -am \
+        -DskipTests -Dgpg.skip=true \
+        -Dmaven.javadoc.skip=true -Djavadoc.skip=true \
+        -Dmaven.source.skip=true -Dcheckstyle.skip=true \
+        -Dmaven.site.skip=true -Dreporting.skip=true \
+        -Dassembly.skipAssembly=true \
+        -B && \
+    cd /build && \
+    mvn dependency:go-offline -B
+
+COPY src/main/java/ src/main/java/
+COPY src/main/resources/ src/main/resources/
+RUN mvn package -DskipTests -B
+
+# Stage 2: Build Next.js frontend
+FROM node:22-slim AS frontend
+WORKDIR /app
+COPY package.json package-lock.json ./
+RUN npm ci --legacy-peer-deps
+COPY next.config.ts tsconfig.json postcss.config.mjs manifest.yaml ./
+COPY src/app/ src/app/
+COPY src/components/ src/components/
+COPY src/lib/ src/lib/
+COPY public/ public/
+RUN npm run build
+
+# Stage 3: Production runtime (JRE + Node, no JDK, no Maven)
+FROM eclipse-temurin:21-jre AS runner
+
+# Install Node.js 22 runtime (for Next.js). No build tools.
+RUN apt-get update && apt-get install -y --no-install-recommends curl && \
+    curl -fsSL https://deb.nodesource.com/setup_22.x | bash - && \
+    apt-get install -y nodejs && \
+    apt-get clean && rm -rf /var/lib/apt/lists/*
+
+WORKDIR /app
+
+# Create unprivileged runtime user BEFORE any COPY so --chown resolves
+# by name and so recursive chown over /app is never needed (fast builds).
+RUN (groupadd --system --gid 1001 app 2>/dev/null || true) \
+ && (useradd --system --uid 1001 --gid 1001 --no-create-home app 2>/dev/null || true) \
+ && mkdir -p /home/app && chown app:app /home/app
+
+# Spring Boot fat JAR (from java-builder, not the full Maven workspace)
+COPY --chown=app:app --from=java-builder /build/target/agent.jar ./agent.jar
+
+# Next.js build artifacts (from frontend stage — no npm install at runtime)
+COPY --chown=app:app --from=frontend /app/.next ./.next
+COPY --chown=app:app --from=frontend /app/node_modules ./node_modules
+COPY --chown=app:app --from=frontend /app/package.json ./
+COPY --chown=app:app --from=frontend /app/public ./public
+
+# Entrypoint
+COPY --chown=app:app entrypoint.sh ./
+RUN chmod +x entrypoint.sh
+
+# Ensure WORKDIR itself is owned by `app` — `WORKDIR /app` at the top of the
+# stage creates /app as root, and `COPY --chown=app:app` only reassigns the
+# copied files, NOT the parent dir. Without this, any subprocess that tries
+# to mkdir under /app at runtime (Next.js build caches, JVM tmp, etc.) hits
+# EACCES under the unprivileged user and crashes the container.
+RUN chown app:app /app
+USER app
+
+EXPOSE 10000
+# Intentionally NOT setting `ENV NODE_ENV=production` at the image level.
+# NODE_ENV=production at the image level would leak into the Java agent and
+# any shell subprocesses. entrypoint.sh scopes NODE_ENV=production to the
+# Next.js invocation only (see `env NODE_ENV=production npx next start`).
+ENV PORT=10000
+CMD ["./entrypoint.sh"]