feat: Simplify Dockerfile by removing multi-stage build and adjusting file copy paths

Dockerfile

@@ -1,33 +1,3 @@
-# === Stage 1: Build the Play application ===
-FROM --platform=$BUILDPLATFORM sbtscala/scala-sbt:eclipse-temurin-alpine-22_36_1.10.3_3.5.1 AS builder
-
-WORKDIR /app
-
-# Install Node.js and Less CSS preprocessor
-USER root
-RUN apk add --no-cache nodejs npm && \
-    npm install -g less
-
-# Cache dependencies first
-COPY project ./project
-COPY build.sbt ./
-RUN --mount=type=secret,id=github_user \
-    --mount=type=secret,id=github_token \
-    export GITHUB_USER=$(cat /run/secrets/github_user) && \
-    export GITHUB_TOKEN=$(cat /run/secrets/github_token) && \
-    sbt -Dscoverage.skip=true update
-
-# Copy the rest of the code
-COPY . .
-
-# Build the app and stage it
-RUN --mount=type=secret,id=github_user \
-    --mount=type=secret,id=github_token \
-    export GITHUB_USER=$(cat /run/secrets/github_user) && \
-    export GITHUB_TOKEN=$(cat /run/secrets/github_token) && \
-    sbt -Dscoverage.skip=true clean stage
-
-# === Stage 2: Runtime image ===
 FROM --platform=$TARGETPLATFORM eclipse-temurin:22-jre-alpine
 
 # Install Argon2 CLI and libraries
@@ -36,7 +6,7 @@ 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
+COPY ./knockoutwhistweb/target/universal/stage /opt/playapp
 
 # Expose the default Play port
 EXPOSE 9000