remove windows line endings from Dockerfile

docker/Dockerfile

@@ -2,8 +2,6 @@ FROM hseeberger/scala-sbt:eclipse-temurin-11.0.14.1_1.6.2_2.13.8 as build
 
 WORKDIR /app
 
-# Copy the project files necessary for sbt update first and then run update. These layers will be cached and
-# sbt update will not be run unless these files change.
 COPY / /
 RUN sbt update
 
@@ -17,4 +15,6 @@ WORKDIR /app
 COPY --from=build /app/target/universal/stage /app
 
 COPY docker/entrypoint.sh /app/entrypoint.sh
+RUN sed -i 's/\r$//' /app/entrypoint.sh && chmod +x /app/entrypoint.sh
+
 ENTRYPOINT ["/app/entrypoint.sh"]