#898: Fix cache path can be undefined. Reuse cache if using pull-policy only

[hverlin]

Fix #898

    create-cache starting alpine:latest (test)
    create-cache copied to docker volumes in 872 ms
    create-cache $ echo "Hello World" > file.txt
    create-cache finished in 1.86 s
    create-cache exported cache file.txt 'my-cache-key-pull-only' in 837 ms
    use-cache starting alpine:latest (test)
    use-cache copied to docker volumes in 791 ms
    use-cache imported cache 'my-cache-key-pull-only' in 53 ms
    use-cache $ cat file.txt
    use-cache > Hello World
    use-cache $ rm file.txt
    use-cache finished in 1.61 s
    use-cache-2 starting alpine:latest (test)
    use-cache-2 copied to docker volumes in 768 ms
    use-cache-2 imported cache 'my-cache-key-pull-only' in 55 ms
    use-cache-2 $ cat file.txt
    use-cache-2 > Hello World
    use-cache-2 finished in 1.56 s

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[hverlin]

@firecow I think this fix is incorrect, actually. Seems that GitLab CI requires the paths to be set:

• without paths, failed: https://gitlab.com/hverlin/gitlab-ci-local-tests/-/pipelines/1081626501
• with paths, worked: https://gitlab.com/hverlin/gitlab-ci-local-tests/-/jobs/5596024562

[firecow]

Great, lets close the issue then 👍