ci: update packer-builder (#4017)

ci/set_variables.sh

@@ -0,0 +1,46 @@
+function set_variables() {
+  if [ $# -gt 0 ]; then
+    pack=$1
+  fi
+
+  if [ $# -gt 1 ]; then
+    github_user=$2
+  fi
+
+  if [ $# -gt 2 ]; then
+    branch=$3
+  fi
+
+  if [ $# -gt 4 ]; then
+    image_link="$4"
+    image_checksum="$5"
+  fi
+
+  # Initialize the variables string
+  vars=""
+
+  # Add the pack variable if it is defined
+  if [ -n "${pack}" ]; then
+    vars="$vars -var pack=${pack}"
+  fi
+
+  # Add the github_user variable if it is defined
+  if [ -n "${github_user}" ]; then
+    vars="$vars -var github_user=${github_user}"
+  fi
+
+  # Add the branch variable if it is defined
+  if [ -n "${branch}" ]; then
+    vars="$vars -var branch=${branch}"
+  fi
+
+  # Add the image_link variable if it is defined
+  if [ -n "${image_link}" ]; then
+    vars="$vars -var image_link=${image_link}"
+  fi
+
+  # Add the image_checksum variable if it is defined
+  if [ -n "${image_checksum}" ]; then
+    vars="$vars -var image_checksum=${image_checksum}"
+  fi
+}