always build the latest tag

docker/netdisco-postgresql/Dockerfile

@@ -1,20 +1,16 @@
 # vim: ft=Dockerfile
 FROM docker.io/postgres:9.6.6-alpine
 
-ARG TAG
-ENV TAG ${TAG:-master}
-
 RUN apk add --no-cache \
   curl \
   jq \
   tar
 
 WORKDIR /var/lib/postgresql/netdisco-sql
-RUN curl -sL "https://api.github.com/repos/netdisco/netdisco/tarball/${TAG}" | \
-  tar --wildcards -zt '*App-Netdisco-DB-*' | xargs -n1 basename | sort -n -t '-' -k4 | \
-  while read file; \
-    do curl -sLO "https://raw.githubusercontent.com/netdisco/netdisco/${TAG}/share/schema_versions/$file"; \
-  done && \
+RUN curl -s https://api.github.com/repos/netdisco/netdisco/tags | \
+  jq '.[]|.name|select(test("^\\d+\\.\\d+$"))|"https://api.github.com/repos/netdisco/netdisco/tarball/"+.' | \
+  sort -rg | head -n1 | xargs -n1 curl -sL | \
+  tar --wildcards --strip-components=3 -zx '*App-Netdisco-DB-*' && \
   curl -sLO "https://raw.githubusercontent.com/netdisco/upstream-sources/master/ieee/oui.sql" && \
   curl -sLO "https://raw.githubusercontent.com/netdisco/netdisco/master/lib/App/Netdisco/DB.pm"
 

docker/netdisco-postgresql/hooks/build

@@ -1,2 +0,0 @@
-#!/bin/bash
-docker build --build-arg TAG=$SOURCE_BRANCH -t $IMAGE_NAME .