Update Alpine to 3.7 (for multiarch support)

* Add arm32v7, arm64v8, and ppc64le (and a note about Alpine variants)
* Add support for s390x via "apt-get source --compile"
  - This takes advantage of the fact that https://nginx.org/packages includes the source packages as well,
    and simply compiles them on non-prebuilt architectures instead,
    which ensures we have a completely compatible experience with minimal maintenance overhead.
* Added new architectures for non-perl tags as well.

Author: denji

generate-stackbrew-library.sh

@@ -9,7 +9,7 @@ aliases=(
 
 self="$(basename "$BASH_SOURCE")"
 cd "$(dirname "$(readlink -f "$BASH_SOURCE")")"
-base=jessie
+base=stretch
 
 versions=( */ )
 versions=( "${versions[@]%/}" )
@@ -65,11 +65,27 @@ for version in "${versions[@]}"; do
 	echo
 	cat <<-EOE
 		Tags: $(join ', ' "${versionAliases[@]}")
+		Architectures: amd64, arm32v7, arm64v8, i386, ppc64le, s390x
 		GitCommit: $commit
 		Directory: $version/$base
 	EOE
 
-	for variant in alpine; do
+	for variant in stretch-perl; do
+		commit="$(dirCommit "$version/$variant")"
+
+		variantAliases=( "${versionAliases[@]/%/-perl}" )
+		variantAliases=( "${variantAliases[@]//latest-/}" )
+
+		echo
+		cat <<-EOE
+			Tags: $(join ', ' "${variantAliases[@]}")
+			Architectures: amd64, arm32v7, arm64v8, i386, ppc64le, s390x
+			GitCommit: $commit
+			Directory: $version/$variant
+		EOE
+	done
+
+	for variant in alpine alpine-perl; do
 		commit="$(dirCommit "$version/$variant")"
 
 		variantAliases=( "${versionAliases[@]/%/-$variant}" )
@@ -78,8 +94,10 @@ for version in "${versions[@]}"; do
 		echo
 		cat <<-EOE
 			Tags: $(join ', ' "${variantAliases[@]}")
+			Architectures: amd64, arm32v6, arm64v8, i386, ppc64le, s390x
 			GitCommit: $commit
 			Directory: $version/$variant
 		EOE
 	done
+
 done