Provide a pretty release link in the Dockerfile

Resolves #49.

.gitlab-ci.yml

@@ -202,6 +202,7 @@ release:
         curl -sSf --header "JOB-TOKEN: ${CI_JOB_TOKEN}" --upload-file output/${group}.tar.xz.SHA256 ${PACKAGE_REGISTRY_URL}/${group}-${BUILD_VERSION}.tar.xz.SHA256
         sed "/TEMPLATE_ROOTFS_FILE/d" Dockerfile.template > output/Dockerfile.${group}
         package_url=$(./ci/get-public-download-for-generic-package.sh ${group}-${BUILD_VERSION}.tar.xz)
+        sed -i "s|TEMPLATE_ROOTFS_RELEASE_URL|https://gitlab.archlinux.org/archlinux/archlinux-docker/-/releases/v${BUILD_VERSION}|" output/Dockerfile.${group}
         sed -i "s|TEMPLATE_ROOTFS_URL|${package_url}|" output/Dockerfile.${group}
         sed -i "s|TEMPLATE_ROOTFS_HASH|$(cat output/${group}.tar.xz.SHA256)|" output/Dockerfile.${group}
       done

Dockerfile.template

@@ -12,6 +12,7 @@ FROM alpine:3.12 AS verify
 COPY TEMPLATE_ROOTFS_FILE /
 RUN apk add --no-cache curl bash
 SHELL ["/bin/bash", "-c"]
+# TEMPLATE_ROOTFS_RELEASE_URL
 RUN ROOTFS="$(curl -sOJL --continue-at - -w "%{filename_effective}" TEMPLATE_ROOTFS_URL)" && \
     sha256sum -c <<< "TEMPLATE_ROOTFS_HASH" && \
     mkdir /rootfs && \

Makefile

@@ -36,6 +36,7 @@ endef
 
 define dockerfile
 	sed -e "s|TEMPLATE_ROOTFS_FILE|$(1).tar.xz|" \
+	    -e "s|TEMPLATE_ROOTFS_RELEASE_URL|Local build|" \
 	    -e "s|TEMPLATE_ROOTFS_URL|file:///$(1).tar.xz|" \
 	    -e "s|TEMPLATE_ROOTFS_HASH|$$(cat $(OUTPUTDIR)/$(1).tar.xz.SHA256)|" \
 	    Dockerfile.template > $(OUTPUTDIR)/Dockerfile.$(1)