fix(installer): resolve lockfile path before cd changes cwd

Capture _script_dir as the script's absolute directory before the
top-level cd, so _installPipCommon finds requirements-common_lock.txt
at the script's location rather than the post-cd working directory.

Signed-off-by: Jack Luar <jluar@precisioninno.com>

Author: luarss

etc/DependencyInstaller.sh

@@ -2,13 +2,16 @@
 
 set -euo pipefail
 
-# Make sure we are on the correct folder before beginning
+# Capture the script's absolute directory before any cd
 if [[ "$OSTYPE" == "darwin"* ]]; then
-    cd "$(dirname $(perl -e 'use Cwd "abs_path";print abs_path(shift)' $0))/../"
+    _script_dir="$(dirname $(perl -e 'use Cwd "abs_path";print abs_path(shift)' $0))"
 else
-    cd "$(dirname $(readlink -f $0))/../"
+    _script_dir="$(dirname $(readlink -f $0))"
 fi
 
+# Make sure we are on the correct folder before beginning
+cd "${_script_dir}/../"
+
 # package versions
 klayoutVersion=0.30.7
 if [[ "$OSTYPE" == "darwin"* ]]; then
@@ -37,7 +40,7 @@ _installPipCommon() {
         set -u
     fi
     local lockfile
-    lockfile="$(cd "$(dirname "$0")" && pwd)/requirements-common_lock.txt"
+    lockfile="${_script_dir}/requirements-common_lock.txt"
     if [[ "$OSTYPE" == "darwin"* ]]; then
         if [[ "$EUID" -eq 0 ]]; then
             echo "Error: Do NOT run with sudo."