Add build hooks and build variables

Dockerfile

@@ -2,9 +2,17 @@
 # Based on Ubuntu 20.04 LTS
 FROM ubuntu:20.04
 
-# Version
+# Build arguments
+ARG BUILD_DATE
+ARG VCS_REF
 ARG VERSION=0.0.9
 
+# Labels
+LABEL com.wiorca.build-date=$BUILD_DATE \
+      com.wiorca.vcs-url="https://github.com/wiorca/docker-pia.git" \
+      com.wiorca.vcs-ref=$VCS_REF \
+      com.wiorca.schema-version=$VERSION
+
 # The volume for the docker_user home directory, and where configuration files should be stored.
 VOLUME [ "/config" ]
 

hooks/build

@@ -0,0 +1,8 @@
+#!/bin/bash
+
+# $IMAGE_NAME var is injected into the build so the tag is correct. 
+
+docker build --build-arg VCS_REF=`git rev-parse --short HEAD` \
+  --build-arg BUILD_DATE=`date -u +”%Y-%m-%dT%H:%M:%SZ”` \
+  -t $IMAGE_NAME .
+