Using hook to pass image name for automated build

We need to pass the argument `BASE_IMAGE` to docker build in order to specify whether we're building on Debian stretch or buster, but dockerhub's automated builds don't let you do this directly. This is a workaround per [this issue](docker/hub-feedback#508).
icepack · Aug 8, 2019 · 036ac00 · 036ac00
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diff --git a/build-images.sh b/build-images.sh
diff --git a/hooks/build b/hooks/build
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+#!/bin/bash
+
+docker build --build-arg BASE_IMAGE=$BASE_IMAGE --tag $IMAGE_NAME .
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		#!/bin/bash

		docker build --build-arg BASE_IMAGE=$BASE_IMAGE --tag $IMAGE_NAME .