fix: add directory prune to int build config

build/int.cloudbuild.yaml

@@ -14,6 +14,20 @@
 
 timeout: 14400s
 steps:
+- id: prune unchanged directories
+  name: gcr.io/cloud-builders/git
+  entrypoint: bash
+  args: 
+    - -c
+    - | 
+      git fetch --unshallow
+      git diff origin/${_BASE_BRANCH}..origin/${_HEAD_BRANCH} --name-only > _changed_files
+      sed 's/\/.*/\//' _changed_files > _changed_folders
+      for d in */; do
+          if ! grep -q ^$d _changed_folders; then
+            rm -rf $d;
+          fi
+      done
 - id: prepare
   name: 'gcr.io/cloud-foundation-cicd/$_DOCKER_IMAGE_DEVELOPER_TOOLS:$_DOCKER_TAG_VERSION_DEVELOPER_TOOLS'
   args: ['/bin/bash', '-c', 'source /usr/local/bin/task_helper_functions.sh && prepare_environment']