Initial commit: Scala/Thorium task manager demo app

Dockerfile

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+# === Build stage ===
+FROM eclipse-temurin:17 AS build
+
+# Install sbt
+RUN apt-get update && apt-get install -y curl gnupg && \
+    echo "deb https://repo.scala-sbt.org/scalasbt/debian all main" > /etc/apt/sources.list.d/sbt.list && \
+    curl -sL "https://keyserver.ubuntu.com/pks/lookup?op=get&search=0x2EE0EA64E40A89B84B2DF73499E82A75642AC823" | apt-key add && \
+    apt-get update && apt-get install -y sbt && \
+    rm -rf /var/lib/apt/lists/*
+
+WORKDIR /app
+
+# Cache dependency resolution
+COPY build.sbt .
+COPY project/build.properties project/
+COPY project/plugins.sbt project/
+RUN sbt update
+
+# Copy source and build fat JAR
+COPY src/ src/
+RUN sbt assembly
+
+# === Runtime stage ===
+FROM eclipse-temurin:17-jre-alpine
+
+RUN addgroup -S app && adduser -S app -G app
+WORKDIR /app
+
+COPY --from=build /app/target/scala-3.7.1/demoapp.jar ./demoapp.jar
+
+RUN chown -R app:app /app
+USER app
+
+EXPOSE 8080
+
+ENV PORT=8080
+ENV JAVA_OPTS="-XX:MaxRAMPercentage=75.0 -XX:+UseSerialGC"
+
+ENTRYPOINT ["sh", "-c", "exec java $JAVA_OPTS -jar demoapp.jar"]