Add proper support for working-directory & fix command builder (#772)

* fix: align other Docker executors to print action

* fix: formatting

* fix: add proper workdir support

* fix: replace script filepath after slice creation

* fix: match substring so it works for pwsh

+ rename containerPath to scriptPath to reflect what value it contains

pkg/runner/testdata/dir with spaces/push.yml

@@ -0,0 +1,7 @@
+---
+jobs:
+  dir-with-spaces:
+    runs-on: ubuntu-latest
+    steps:
+      - run: echo "$PWD"
+'on': push