github workflow to update docker image

Runner.Dockerfile

@@ -0,0 +1,14 @@
+FROM adoptopenjdk/openjdk16:alpine-jre  AS base-core
+ENV JAVA_HOME="/usr/lib/jvm/default-jvm/"
+RUN apk add --update ttf-dejavu
+ENV PATH=$PATH:${JAVA_HOME}/bin
+
+
+FROM base-core
+WORKDIR /lc-core
+COPY /build/target/scala-2.13/LibreCaptcha.jar .
+RUN mkdir data/
+
+EXPOSE 8888
+
+CMD [ "java", "-jar", "LibreCaptcha.jar" ]