Fix passing of netrc credentials to clone step

[anbraten]

closes #479

[6543]

https://github.com/woodpecker-ci/woodpecker/pull/492/files#diff-a18d8d720eb5f833ad6f93acf56edd1655defc1147766e4338e7df9e768b177dR135

Need it too
(Own clone step)

Later I would set a allowlist tor images able to use specific securety scopes ... but thats later

[6543]

status: could not verify fix by manual testing :/

[anbraten]

@6543 I have tested it with the adjusted code (with woodpeckerci/plugin-git:next).
Could you verify the repo you test has: private: false with https://ci.example.tld/api/repos/<owner>/<repo>.

My test config looks like:

pipeline:
  test:
    image: golang:1.16
    group: test
    commands:
      - env | grep CI_
      - echo "hello world 123"

[6543]

works