Try for automated build compatibility on dockerhub

Added Dockerfile on master

Dockerfile

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+# Base image : latest stable Debian 
+FROM debian:latest
+
+# Install needed packages
+RUN apt-get update && apt-get install -yq \
+	default-jdk \
+	ant
+	
+# Clean apt cache
+RUN apt-get clean
+	
+# copy context : should be a YaCy git repository (remote or locally cloned)
+# context can also be obtained from extracted sources archive, but version number will be default to 1.83/9000 when building
+COPY ./ /opt/yacy_search_server/
+
+# trace content of copied directory
+RUN ls -la /opt/yacy_search_server
+
+# set current working dir to extracted sources directory
+WORKDIR /opt/yacy_search_server
+	
+# Compile with ant
+RUN ant compile
+
+# clean .git directory useless now
+RUN rm -rf .git
+
+# Expose port 8090
+EXPOSE 8090
+
+# Set data volume : can be used to persist yacy data and configuration
+VOLUME ["/opt/yacy_search_server/DATA"]
+
+# Start yacy ind debug mode (-d) to display console logs and to wait for yacy process
+CMD sh /opt/yacy_search_server/startYACY.sh -d