Dockerfile and heroku.yml update 1 (should fix error with yml)

Dockerfile

+#
+# Build stage
+#
+FROM maven:3.6.0-jdk-11-slim AS build
+COPY src /src
+COPY pom.xml /
+RUN mvn package
+EXPOSE 8080
+RUN apt-get -y update && apt-get -y install pandoc texlive-latex-recommended
+CMD ["sh", "target/bin/simplewebapp"]
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heroku.yml

+build:
+  docker:
+    web: Dockerfile
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