dockerfile now has versioning

Dockerfile

@@ -5,7 +5,8 @@ RUN apk add --no-cache libcap-static libpcap-dev linux-headers git go file --rep
 
 RUN git clone https://github.com/mosajjal/dnsmonster.git /opt/dnsmonster --depth 1 \
     && cd /opt/dnsmonster/src \
-    && go build --ldflags "-L /usr/lib/libcap.a -linkmode external -extldflags \"-static\"" 
+    && export LATEST_TAG=`git describe --tags` \
+    && go build --ldflags "-L /usr/lib/libcap.a -linkmode external -X main.releaseVersion=$LATEST_TAG -extldflags \"-static\""
 
 FROM scratch
 COPY --from=0 /opt/dnsmonster/src/dnsmonster /dnsmonster