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FROM amazoncorretto:17
EXPOSE 80
# Heroku uses the PORT environment variable, it ignores EXPOSE.
# This also allows to specify a custom port when running the container even outside of Heroku.
ENV PORT 80
ARG JAR_FILE=build/libs/sw-server.jar
COPY ${JAR_FILE} app.jar
# We need sh to perform the substitution of $PORT
# We cannot use ENTRYPOINT because Heroku escapes the $ in ENTRYPOINT, so CMD it is
CMD ["sh", "-c", "java -Dserver.port=$PORT -jar /app.jar"]
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