Added Dockerfile

Dockerfile

@@ -0,0 +1,45 @@
+FROM debian:buster-slim
+
+ARG dir="/home/pi/pialert"
+
+#Update and reduce image size
+RUN apt update \
+    && apt install --no-install-recommends apt-utils cron sudo lighttpd php php-cgi php-fpm php-sqlite3 sqlite3 dnsutils net-tools python iproute2 -y \
+    #Install without the --no-install-recommends flag
+    && apt install curl arp-scan -y \
+    #clean-up
+    && apt clean autoclean \
+    && apt autoremove 
+
+#add the pi user
+RUN useradd -ms /bin/bash pi 
+WORKDIR /home/pi
+
+# Lighttpd & PHP
+RUN mv /var/www/html/index.lighttpd.html /var/www/html/index.lighttpd.html.old \
+    && ln -s $dir/install/index.html /var/www/html/index.html \
+    && lighttpd-enable-mod fastcgi-php 
+
+COPY . $dir
+
+# delete .git/ files and the tar/ realese directory to make the image smaller
+RUN rm -r $dir/.git \
+    && rm -r $dir/tar 
+
+# Pi.Alert   
+RUN ln -s $dir/front /var/www/html/pialert  \
+    && python $dir/back/pialert.py update_vendors \    
+    && (crontab -l 2>/dev/null; cat $dir/install/pialert.cron) | crontab - \
+    && chgrp -R www-data $dir/db \
+    && chmod -R 770 $dir/db \
+    # changing the default port number 80 to something random, here 20211
+    && sed -ie 's/= 80/= 20211/g' /etc/lighttpd/lighttpd.conf \
+    && service lighttpd restart 
+
+# Expose the below port
+EXPOSE 20211
+
+# Set up startup script to run two commands, cron and the lighttpd server
+RUN chmod +x $dir/dockerfiles/start.sh
+
+CMD ["/home/pi/pialert/dockerfiles/start.sh"]