chore: create docker artifacts

Signed-off-by: Alan Brault <alan.brault@visus.io>

.dockerignore

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+build/
+.gradle/
+.kotlin/
+
+.idea/
+*.iml
+.vscode/
+.editorconfig
+
+.git/
+.gitattributes
+.gitignore
+
+.env
+.env.*
+!.env.example
+
+HELP.md
+*.md
+
+.DS_Store
+Thumbs.db

Dockerfile

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+# syntax=docker/dockerfile:1
+
+# ── Stage 1: Builder ──────────────────────────────────────────────────────────
+# eclipse-temurin:21-jdk-noble
+FROM eclipse-temurin@sha256:81cecb98bcca2d5d5c3d496e71779073865db0d0bd776ecf434e017f20dac638 AS builder
+
+WORKDIR /workspace
+
+COPY gradle/ gradle/
+COPY gradlew gradlew
+COPY build.gradle.kts build.gradle.kts
+COPY settings.gradle.kts settings.gradle.kts
+COPY gradle.properties gradle.properties
+
+RUN chmod +x gradlew && ./gradlew dependencies --no-daemon
+
+# Source build
+COPY src/ src/
+RUN ./gradlew bootJar --no-daemon -x test -x ktlintCheck
+
+
+# ── Stage 2: Runtime ─────────────────────────────────────────────────────────
+# gcr.io/distroless/java21-debian12 — no shell, no package manager, minimal attack surface
+# Predefined nonroot user UID/GID: 65532
+FROM gcr.io/distroless/java21-debian12@sha256:f34fd3e4e2d7a246d764d0614f5e6ffb3a735930723fac4cfc25a72798950262 AS runtime
+
+WORKDIR /app
+
+# Glob matches fat jar (kotlin-api-0.0.1-SNAPSHOT.jar) but not -plain.jar
+# --chown uses numeric UID:GID since distroless has no shell to resolve names
+COPY --from=builder --chown=65532:65532 /workspace/build/libs/kotlin-api-*SNAPSHOT.jar app.jar
+
+USER 65532
+
+EXPOSE 8080
+
+# Leave empty so Spring fails fast with a clear error if not provided at runtime.
+ENV MONGODB_URI=""
+ENV JWT_ENCRYPTION_SECRET=""
+
+ENTRYPOINT ["/usr/bin/java", \
+  "-XX:+UseContainerSupport", \
+  "-XX:MaxRAMPercentage=75.0", \
+  "-Djava.security.egd=file:/dev/./urandom", \
+  "-jar", "/app/app.jar"]

docker-compose.yml

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+services:
+  app:
+    build: .
+    ports:
+      - "8080:8080"
+    environment:
+      # Override the local-dev default — "mongodb" resolves to the service below
+      MONGODB_URI: mongodb://mongodb:27017/kotlin-api
+      # Interpolated from .env (copy .env.example → .env and fill in the value)
+      JWT_ENCRYPTION_SECRET: ${JWT_ENCRYPTION_SECRET}
+    depends_on:
+      mongodb:
+        condition: service_healthy
+    networks:
+      - backend
+
+  mongodb:
+    # mongo:8.0
+    image: mongo@sha256:f93b9015613e393b76fdf4fb71f3435ece6a3b46cc56c62c08875ad08442aa4c
+    ports:
+      - "27017:27017"
+    environment:
+      MONGO_INITDB_DATABASE: kotlin-api
+    volumes:
+      - mongodb_data:/data/db
+    healthcheck:
+      test: ["CMD", "mongosh", "--eval", "db.adminCommand('ping')"]
+      interval: 10s
+      timeout: 5s
+      retries: 5
+      start_period: 10s
+    networks:
+      - backend
+
+networks:
+  backend:
+    driver: bridge
+
+volumes:
+  mongodb_data: