fix build script exit code and fix typo in README (#1472)

Author: whhe

README.md

@@ -97,7 +97,7 @@ Please see [Coding gh-ost](doc/coding-ghost.md) for a guide to getting started d
 
 `gh-ost` is a Go project; it is built with Go `1.15` and above. To build on your own, use either:
 - [script/build](https://github.com/github/gh-ost/blob/master/script/build) - this is the same build script used by CI hence the authoritative; artifact is `./bin/gh-ost` binary.
-- [build.sh](https://github.com/github/gh-ost/blob/master/build.sh) for building `tar.gz` artifacts in `/tmp/gh-ost`
+- [build.sh](https://github.com/github/gh-ost/blob/master/build.sh) for building `tar.gz` artifacts in `/tmp/gh-ost-release`
 
 Generally speaking, `master` branch is stable, but only [releases](https://github.com/github/gh-ost/releases) are to be used in production.
 

build.sh

@@ -1,6 +1,4 @@
 #!/bin/bash
-#
-#
 
 RELEASE_VERSION=
 buildpath=
@@ -72,11 +70,14 @@ main() {
   build macOS osx darwin amd64
   build macOS osx darwin arm64
 
+  bin_files=$(find $buildpath/gh-ost* -type f -maxdepth 1)
   echo "Binaries found in:"
-  find $buildpath/gh-ost* -type f -maxdepth 1
+  echo "$bin_files"
 
   echo "Checksums:"
-  (cd $buildpath && shasum -a256 gh-ost* 2>/dev/null)
+  (shasum -a256 $bin_files 2>/dev/null)
+
+  echo "Build Success!"
 }
 
 main "$@"