bug: fix named volume detection logic

[ms-jpq]

What type of PR is this?

/kind bug

What this PR does / why we need it:

Currently an input with a named volume defined in the same docker-compose.yml would produce an error like so:

WARN File don't exist or failed to check if the directory is empty: stat :/app/data: no such file or directory

minimal example:

---
services:
  example:
    image: bash
    volumes:
      - data:/app/data

volumes:
  data:

This bug was introduced here, the code for checking say /app/data in the example below, neglected to account for volumes like the one shown above.

volumes:
  - /app/data

This PR simply adds a check to data:, as in data:/app/data, where as currently this is treated identically to just /app/data.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

[linux-foundation-easycla]

• ✅login: ms-jpq / (c151f1c)

The committers listed above are authorized under a signed CLA.

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[cdrage]

This LGTM. Thank you so much for this fix!

[cdrage]

/approve

[cdrage]

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: cdrage, ms-jpq

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[cdrage]

Failing tests :( are you able to check the failed TestMultipleContainersInPod test?