woodpecker-agent only accepts docker backend

[babykart]

Component

agent

Describe the bug

Actually, v0.15.6 version of woodpecker-agent only accept docker backend.

woodpecker-agent --backend-engine auto-detect
{"level":"error","error":"Can't detect an available backend engine","time":"2023-02-23T22:32:21+01:00","message":"cannot find backend engine 'auto-detect'"}

woodpecker-agent --backend-engine kubernetes
{"level":"error","error":"Backend engine 'kubernetes' not found","time":"2023-02-23T22:33:14+01:00","message":"cannot find backend engine 'kubernetes'"}

System Info

woodpecker-agent version 0.15.6

image: 'docker.io/woodpeckerci/woodpecker-agent:v0.15.6'

Additional context

No response

Validations

• [X] Read the Contributing Guidelines.
• [X] Read the docs.
• [X] Check that there isn't already an issue that reports the same bug to avoid creating a duplicate.
• [X] Check that this is a concrete bug. For Q&A join our Discord Chat Server or the Matrix room.

[qwerty287]

You need the next version to use anything else

[babykart]

Effectively, it works better with next tag. Thank you.