Matrix variable not usable in environment

[simmstein]

Component

server, agent

Describe the bug

When a variable is defined through a matrix, it's not possible to use it as environment variable.

This following configuration results on error: failed to parse pipeline: Cannot unmarshal '<nil>' of type <nil> into a string value.

matrix:
 FOO:
   - foo1
   - foo2

steps:
 example:
   image: alpine:latest
   environment:
     BAR: ${FOO}
   commands:
     - echo ${FOO}

But this following config works:

matrix:
  FOO:
    - foo1
    - foo2

steps:
  example:
    image: alpine:latest
    commands:
      - echo ${FOO}

System Info

{"source":"https://github.com/woodpecker-ci/woodpecker","version":"next-0cf602a1"}

Additional context

Example: https://ci.gitnet.fr/repos/315

Validations

• Read the Contributing Guidelines.
• Read the docs.
• Check that there isn't already an issue that reports the same bug to avoid creating a duplicate.
• Checked that the bug isn't fixed in the next version already [https://woodpecker-ci.org/faq#which-version-of-woodpecker-should-i-use]
• Check that this is a concrete bug. For Q&A join our Discord Chat Server or the Matrix room.

[pat-s]

This seems to be the same issue as reported in #2505 (comment)

[zc-devs]

matrix:
  FOO:
    - foo1
    - foo2

steps:
  example:
    image: alpine
    environment:
      BAR: ${FOO}
    commands:
      - echo foo=${FOO}
      - printenv

Can't reproduce on a95f1bc:

Also, it's not necessary to pass matrix variable via environment, as it is available by its name:

[simmstein]

Yes it works: https://ci.gitnet.fr/repos/315/pipeline/4

But, using matrix this ways failed:

matrix:
  PHP_VERSION:
    - 8.1
    - 8.2

steps:
  example:
    image: deblan/php:${PHP_VERSION}
    commands:
      - php -v

• https://ci.gitnet.fr/repos/315/pipeline/7/config
• https://ci.gitnet.fr/repos/315/pipeline/7

matrix:
  PHP_VERSION:
    - 8.1
    - 8.2

steps:
  example:
    image: deblan/php:$PHP_VERSION
    commands:
      - php -v

• https://ci.gitnet.fr/repos/315/pipeline/8/config
• https://ci.gitnet.fr/repos/315/pipeline/8

The next syntax works but is not practical because I can't reuse PHP_VERSION:

matrix:
  PHP_VERSION:
    - deblan/php:8.1
    - deblan/php:8.2

steps:
  example:
    image: ${PHP_VERSION}
    commands:
      - php -v

Expected:

matrix:
  PHP_VERSION:
    - 8.1
    - 8.2

steps:
  foo:
    image: foo/bar:${PHP_VERSION}
  bar:
    image: foo2/bar2:${PHP_VERSION}

[zc-devs]

#2002

[simmstein]

OK, it's now a dupplicated issue so I close it.