fix docker executor on windows and local actions (#34)

Browse Source

If the Workdir field doesn't ends with the filepath seperator,
bad things happen

Fixes #33

Sample for host mode on windows, needs be adjusted for linux e.g. replace pwsh with bash
Also fixes
```yaml
on: push
jobs:
  _:
    runs-on: self-hosted
    steps:
    - uses: actions/checkout@v3
      with:
        path: subdir/action
    - uses: ./subdir/action
```

with an action.yml in the same repo
```yaml
runs:
  using: composite
  steps:
    - run: |
        echo "Hello World"
      shell: pwsh
```

Co-authored-by: Christopher Homberger <christopher.homberger@web.de>
Reviewed-on: https://gitea.com/gitea/act_runner/pulls/34
Reviewed-by: Jason Song <i@wolfogre.com>
Reviewed-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: ChristopherHX <christopherhx@noreply.gitea.io>
Co-committed-by: ChristopherHX <christopherhx@noreply.gitea.io>

This commit was merged in pull request #34.

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