Change default value of PIHOLE_DOCKER_TAG in dockerfile

Signed-off-by: Adam Warner <[email protected]>

src/Dockerfile

@@ -8,7 +8,7 @@ ARG TARGETPLATFORM
 ARG WEB_BRANCH="development-v6"
 ARG CORE_BRANCH="development-v6"
 ARG FTL_BRANCH="development-v6"
-ARG PIHOLE_DOCKER_TAG="unknown"
+ARG PIHOLE_DOCKER_TAG="dev-localbuild"
 ARG PADD_BRANCH="PADD_FTLv6"
 
 ENV DNSMASQ_USER=pihole