action.yml: parse variables line by line (#11) * action.yml: parse variables line by line This fixes the case of when whitespaces are present. See https://github.com/eic/epic/actions/runs/8994924309/job/24712117422?pr=723#step:2:192 * test.yml: test the whitespace case * action.yml: add quotation * action.yml: use bash arrays * action.yml: in echo too * test.yml: no foobar