puppet: Use goarch for wal-g.
puppet: Use goarch for wal-g.

wal-g does not currently provide pre-built binaries for
arm64/aarch64 (see #21070) but if they begin to, it will likely be
with the goarch names.

rht/zulip,kou/zulip,rht/zulip,kou/zulip,zulip/zulip,zulip/zulip,zulip/zulip,zulip/zulip,zulip/zulip,kou/zulip,rht/zulip,andersk/zulip,rht/zulip,andersk/zulip,kou/zulip,rht/zulip,andersk/zulip,kou/zulip,andersk/zulip,kou/zulip,rht/zulip,andersk/zulip,zulip/zulip,andersk/zulip,kou/zulip,rht/zulip,andersk/zulip,zulip/zulip