config: allow multiple base names

scripts/config.sh

@@ -3,7 +3,7 @@
 usage ()
 {
     printf 'Generate parameters for GitHub Actions\n\n'
-    printf 'Usage:\n\t%s <pandoc_version> <build_stack> <image_name>\n' "$0"
+    printf 'Usage:\n\t%s <pandoc_version> <build_stack> <image_names>\n' "$0"
 }
 
 if [ "$#" -ne 3 ]; then
@@ -13,7 +13,7 @@ fi
 
 version="${1:-main}"
 build_stack="${2:-alpine}"
-image_name="${3:-pandoc/minimal}"
+images="${3}"
 
 versions_file=versions.md
 row="$(grep "^| $version " "$versions_file")"
@@ -34,31 +34,39 @@ field ()
 case "${build_stack}" in
     (alpine|static)
         base_image='alpine'
-        base_image_tag="$(field 3)"
+        base_image_version="$(field 3)"
         ;;
     (ubuntu)
         base_image='ubuntu'
-        base_image_tag="$(field 4)"
+        base_image_version="$(field 4)"
         ;;
     (*)
         printf "Unsupported base image: '%s'\n" "$base_image"
         ;;
 esac
 
-printf '%s\n' "$(field 2)"
-
-tagsbase="$(field 2 | sed -e "s#\([^,]*\)#${image_name}:\1#g")"
-tags="$(printf '%s' "$tagsbase" | \
-               sed -e 's#\([^,]*\)#\1-'${base_image}'#g')"
-if ( [ "$image_name" != 'pandoc/minimal' ] && \
-     [ "$build_stack" = 'alpine' ] ) ||
-   ( [ "$image_name"  = 'pandoc/minimal' ] && \
-     [ "$build_stack" = 'static' ] );
-then
-    tags="${tags},${tagsbase}"
-fi
+version_tags="$(field 2)"
+tags=
+for name in $(printf '%s\n' "$images" | tr ',' ' '); do
+    image_tags_base="$( \
+        printf "$version_tags" | sed -e "s#\([^,]*\)#${name}:\1#g" \
+    )"
+    image_tags="$(printf '%s' "$image_tags_base" | \
+                    sed -e 's#\([^,]*\)#\1-'${base_image}'#g')"
+    image_name=$(printf "$name" | sed -e 's#.*\([^/]\+/[^/]\+\)$#\1#')
+    if ( [ "$image_name" != 'pandoc/minimal' ] && \
+         [ "$build_stack" = 'alpine' ] ) ||
+       ( [ "$image_name"  = 'pandoc/minimal' ] && \
+         [ "$build_stack" = 'static' ] );
+    then
+        tags="${tags},${image_tags_base},${image_tags}"
+    else
+        tags="${tags},${image_tags}"
+    fi
+done
+tags=$(printf '%s\n' "$tags" | sed -e 's/^,//')
 
 printf 'tags="%s"\n' "$tags"
 printf 'base_image="%s"\n' "$base_image"
-printf 'base_image_tag="%s"\n' "$base_image_tag"
+printf 'base_image_version="%s"\n' "$base_image_version"
 printf 'texlive_version="%s"\n' "$(field 5)"