feat(docker): added docker container support (#47)

Reviewed-on: #47
Co-authored-by: Janis <janis.e.20@gmx.de>
Co-committed-by: Janis <janis.e.20@gmx.de>

Dockerfile

@@ -0,0 +1,41 @@
+# === Stage 1: Build the Play application ===
+FROM sbtscala/scala-sbt:eclipse-temurin-alpine-22_36_1.10.3_3.5.1 AS builder
+
+WORKDIR /app
+
+# Install Node.js and Less CSS preprocessor
+USER root
+RUN apk add --no-cache nodejs npm && \
+    npm install -g less
+
+# Cache dependencies first
+COPY project ./project
+COPY build.sbt ./
+RUN sbt -Dscoverage.skip=true update
+
+# Copy the rest of the code
+COPY . .
+
+# Build the app and stage it
+RUN sbt -Dscoverage.skip=true clean stage
+
+# === Stage 2: Runtime image ===
+FROM eclipse-temurin:21-jre-alpine
+
+# Install Argon2 CLI and libraries
+RUN apk add --no-cache bash argon2 argon2-libs
+
+WORKDIR /opt/playapp
+
+# Copy staged Play build
+COPY --from=builder /app/knockoutwhistweb/target/universal/stage /opt/playapp
+
+# Expose the default Play port
+EXPOSE 9000
+
+# Set environment variables
+ENV PLAY_HTTP_PORT=9000
+
+# Run the Play app
+ENTRYPOINT ["./bin/knockoutwhistweb"]
+CMD ["-Dplay.server.pidfile.path=/dev/null"]