Fix create docker app

[cfdreddbot]

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[florindragos]

👍 Tested this fix and it works. We should have a separate test for docker apps, maybe even one that actually starts an app from a docker image.

[florindragos]

verify this please

[hcf-bot]

Verification failed.

[carabasdaniel]

Fixed typo

[mihaibuzgau]

verify this please

[hcf-bot]

Verification failed.

[carabasdaniel]

verify this please

[hcf-bot]

Verification failed.

[carabasdaniel]

verify this please

[hcf-bot]

Verification passed.