* fungiclarkb : hi,when building the diskimage have follow error.

```
cp -a /opt/git/opendev.org/openstack/project-config/nodepool/elements/bindep-fallback.txt /usr/local/bindep-fallback/
cp: cannot stat '/opt/git/opendev.org/openstack/project-config/nodepool/elements/bindep-fallback.txt': No such file or directory
++ diskimage_builder/lib/img-functions:run_in_target:59                             :   check_break after-error run_in_target bash
++ diskimage_builder/lib/common-functions:check_break:143                           :   echo ''
++ diskimage_builder/lib/common-functions:check_break:143                           :   egrep -e '(,|^)after-error(,|$)' -q
+ diskimage_builder/lib/img-functions:run_in_target:1                              :   trap_cleanup
```

**this occur in nodepool-base/post-install.d/89-data-files job.** where should modify. thanks.
diskimage is

```
diskimages:
  - name: ubuntu-focal
    pause: false
    elements:
      - ubuntu-minal
      - vm
      - simple-init
      - nodepool-base
      - cache-devstack
      - initialize-urandom
      - growroot
      - infra-package-needs
    release: focal
    username: zuul
    env-vars:
      TMPDIR: /opt/dib_tmp
      DIB_CHECKSUM: '1'
      DIB_IMAGE_CACHE: /opt/dib_cache
      DIB_APT_LOCAL_CACHE: '0'
      DIB_DISABLE_APT_CLEANUP: '1'
      DIB_DEBOOTSTRAP_EXTRA_ARGS: '--no-check-gpg'
      DIB_DEBIAN_COMPONENTS: 'main,universe'
      DIB_CUSTOM_PROJECTS_LIST_URL: 'file:///etc/nodepool/repos.yaml'
      GIT_HTTP_LOW_SPEED_TIME: '300'
      GIT_HTTP_LOW_SPEED_LIMIT: '1000'
      ZUUL_USER_SSH_PUBLIC_KEY: '/var/lib/nodepool/.ssh/id_rsa.pub'
```