Add arm32v7, arm64v8, and ppc64le (and a note about Alpine variants)

Author: tianon

generate-stackbrew-library.sh

@@ -79,7 +79,7 @@ for version in "${versions[@]}"; do
 		echo
 		cat <<-EOE
 			Tags: $(join ', ' "${variantAliases[@]}")
-			Architectures: amd64, i386, s390x
+			Architectures: amd64, arm32v7, arm64v8, i386, ppc64le, s390x
 			GitCommit: $commit
 			Directory: $version/$variant
 		EOE
@@ -91,6 +91,8 @@ for version in "${versions[@]}"; do
 		variantAliases=( "${versionAliases[@]/%/-$variant}" )
 		variantAliases=( "${variantAliases[@]//latest-/}" )
 
+		# TODO Architectures once https://github.com/gliderlabs/docker-alpine/issues/304 is resolved
+
 		echo
 		cat <<-EOE
 			Tags: $(join ', ' "${variantAliases[@]}")