Add s390x binaries for Linux to releases and fix ppc64le release binaries (#3900)

Author: jonathan-albrecht-ibm

CHANGELOG.md

@@ -3,6 +3,8 @@
 ## [Unreleased]
 
 - Add `buf export --all` flag to include non-proto source files.
+- Add s390x binaries for Linux to releases.
+- Fix ppc64le binaries for Linux released as x86_64 binaries.
 
 ## [v1.55.1] - 2025-06-17
 

make/buf/scripts/release.bash

@@ -18,7 +18,7 @@ goos() {
     Darwin) echo darwin ;;
     Linux) echo linux ;;
     Windows) echo windows ;;
-    *) return 1 ;;
+    *) echo "unsupported"; return 1 ;;
   esac
 }
 
@@ -29,7 +29,9 @@ goarch() {
     arm64) echo arm64 ;;
     aarch64) echo arm64 ;;
     armv7) echo arm ;;
-    *) return 1 ;;
+    ppc64le) echo ppc64le ;;
+    s390x) echo s390x ;;
+    *) echo "unsupported"; return 1 ;;
   esac
 }
 
@@ -85,7 +87,7 @@ mkdir -p "${RELEASE_DIR}"
 cd "${RELEASE_DIR}"
 
 for os in Darwin Linux Windows; do
-  for arch in x86_64 riscv64 arm64 armv7 ppc64le; do
+  for arch in x86_64 riscv64 arm64 armv7 ppc64le s390x; do
     # our goal is to have the binaries be suffixed with $(uname -s)-$(uname -m)
     # on mac, this is arm64, on linux, this is aarch64, for historical reasons
     # this is a hacky way to not have to rewrite this loop (and others below)
@@ -118,7 +120,7 @@ for os in Darwin Linux Windows; do
 done
 
 for os in Darwin Linux Windows; do
-  for arch in x86_64 riscv64 arm64 armv7 ppc64le; do
+  for arch in x86_64 riscv64 arm64 armv7 ppc64le s390x; do
     if [[ ! "${arch}" =~ x86_64|arm64 ]] && [ "${os}" != "Linux" ]; then
       continue
     fi
@@ -141,7 +143,7 @@ for os in Darwin Linux Windows; do
 done
 
 for os in Darwin Linux; do
-  for arch in x86_64 riscv64 arm64 armv7 ppc64le; do
+  for arch in x86_64 riscv64 arm64 armv7 ppc64le s390x; do
     if [[ ! "${arch}" =~ x86_64|arm64 ]] && [ "${os}" != "Linux" ]; then
       continue
     fi

make/go/dep_protoc.mk

@@ -32,8 +32,12 @@ endif
 endif
 ifeq ($(UNAME_OS),Linux)
 PROTOC_OS = linux
+ifeq ($(UNAME_ARCH),s390x)
+PROTOC_ARCH := s390_64
+else
 PROTOC_ARCH := $(UNAME_ARCH)
 endif
+endif
 
 PROTOC := $(CACHE_VERSIONS)/protoc/$(PROTOC_VERSION)
 $(PROTOC):