Fix unexpected script_path behaviour

When one calls the `build.sh` scripts with bash instead of the shebang
`$script_path` contains the filepath, not the parent dir:

```
% cd /path
% grep -A2 script_path= build.sh
script_path=$(readlink -f "${0%/*}")
echo "$script_path"
exit 0
% ./build.sh
/path
% bash build.sh
/path/build.sh
```

This commit fixes that:

```
% grep -A2 script_path= build.sh
script_path="$( cd -P "$( dirname "$(readlink -f "$0")" )" && pwd )"
echo "$script_path"
exit 0
% ./build.sh
/path
% bash build.sh
/path
```

1 files changed, 1 insertions, 1 deletions

diff --git a/configs/baseline/build.sh b/configs/baseline/build.sh
index 45e76cf..b86c7c8 100755
--- a/configs/baseline/build.sh
+++ b/configs/baseline/build.sh
@@ -10,7 +10,7 @@ arch=$(uname -m)
 work_dir=work
 out_dir=out
 
-script_path=$(readlink -f "${0%/*}")
+script_path="$( cd -P "$( dirname "$(readlink -f "$0")" )" && pwd )"
 
 umask 0022