Absolute path to the test files in spec parameter

[ppp3]

Hello,
I have a cypress installation: c:\cypress-tests on e2e-server. A gitlab runner should execute the tests. It is installed in c:\gitlab-runner. Is it possible to use an absolute paths to specify the testfiles? Name of the repo is myrepo and the files with the test files are in myrepo\tests. This is the path C:\gitlab-runner\builds\8at1ezLK\0\miller\myrepo\tests.
If try to use the absolute path, it doesn't work.

.gitlab-ci.yml:

- SET var=%cd%
- c:\cypress-tests
- node_modules\\.bin\\cypress run --browser=firefox --headless --spec '%var%/tests/test1.spec.js'

Error message:
Can't run because no spec files were found.
We searched for any files matching this glob pattern:
builds\8at1ezLK\0\miller\myrepo\tests\test1.spec.js'
Relative to the project root folder:
C:\gitlab-runner