Parametrise Github/Dockerhub dockerfile

Not a big win as-is. It will make the upcoming introduction of
multilib-devel a bit saner.

Signed-off-by: Emil Velikov <emil.l.velikov@gmail.com>

.gitlab-ci.yml

@@ -317,7 +317,16 @@ publish-dockerhub:
     - git reset --hard FETCH_HEAD
     - head="release/${BUILD_VERSION}"
     - git checkout -b "$head"
-    - envsubst < ../docker-library.template > library/archlinux
+    - cp ../docker-library.template library/archlinux
+    - |
+      for group in base base-devel; do
+        test "${group}" = "base" && extra="latest, " || extra=""
+        echo "Tags: ${extra}${group}, ${group}-${BUILD_VERSION}" >> library/archlinux
+        echo "GitCommit: ${BUILD_COMMIT}" >> library/archlinux
+        echo "GitFetch: refs/tags/v${BUILD_VERSION}" >> library/archlinux
+        echo "File: Dockerfile.${group}" >> library/archlinux
+        echo >> library/archlinux
+      done
     - git diff
     - git add library/archlinux
     - maintainers="$(grep \(@ ../docker-library.template | cut -d\( -f2 | cut -d\) -f1 | xargs)"

docker-library.template

@@ -5,13 +5,3 @@ Maintainers: Santiago Torres-Arias <santiago@archlinux.org> (@SantiagoTorres),
              Justin Kromlinger <hashworks@archlinux.org> (@hashworks)
 GitRepo: https://gitlab.archlinux.org/archlinux/archlinux-docker.git
 
-Tags: latest, base, base-${BUILD_VERSION}
-GitCommit: ${BUILD_COMMIT}
-GitFetch: refs/tags/v${BUILD_VERSION}
-File: Dockerfile.base
-
-Tags: base-devel, base-devel-${BUILD_VERSION}
-GitCommit: ${BUILD_COMMIT}
-GitFetch: refs/tags/v${BUILD_VERSION}
-File: Dockerfile.base-devel
-