Use working-directory: . instead of working-directory:

[ydah]

❯ actionlint
.github/workflows/test.yaml:129:27: string should not be empty [syntax-check]
    |
129 |         working-directory:
    |                           ^
.github/workflows/test.yaml:134:27: string should not be empty [syntax-check]
    |
134 |         working-directory:
    |                           ^

refs: https://github.com/rhysd/actionlint