chore: introduce strict bash mode for scripts,.github

REF: #15514

Signed-off-by: Wei Fu <fuweid89@gmail.com>

scripts/build-binary.sh

@@ -1,19 +1,17 @@
 #!/usr/bin/env bash
 
-set -e
+set -euo pipefail
 
 source ./scripts/test_lib.sh
 
-VER=$1
+VER=${1:-}
 REPOSITORY="${REPOSITORY:-git@github.com:etcd-io/etcd.git}"
 
-if [ -z "$1" ]; then
+if [ -z "$VER" ]; then
   echo "Usage: ${0} VERSION" >> /dev/stderr
   exit 255
 fi
 
-set -u
-
 function setup_env {
   local ver=${1}
   local proj=${2}
@@ -60,7 +58,7 @@ function main {
   cd release
   setup_env "${VER}" "${proj}"
 
-  tarcmd=tar
+  local tarcmd=tar
   if [[ $(go env GOOS) == "darwin" ]]; then
       echo "Please use linux machine for release builds."
     exit 1