v6.6.0: Allow projects to be in a subdirectory

New functionality

• Many actions: Add input project_directory to allow specifying the project directory (PR #42):
  • ns-build
  • ns-list
  • project/build-target
  • project/detect-changed-components
  • project/sync-and-cache

Bug fixes

• project/build-target: Do not throw an error if there is no .gitignore in place (PR #42).

• ns-build, ns-list: If Viash throws an error, make sure that the error message gets printed (PR #42).

• project/detect-changed-components: Fix the action not listening to 'ci force' in commit messages (PR #42).