Fixup and enhance invocation of run_tests.sh

ATM it would complain that rc is not legit command due to all those spaces.
Because no set -e used it just continues.

Also made it executable and adjusted shebang to be universaly working.
There should be no need to invoke directly via bash -- shebang would do that

.github/workflows/validate_datasets.yml

@@ -86,5 +86,5 @@ jobs:
     - name: Validate all BIDS datasets using bids-validator
       run: |
         cat ./run_tests.sh
-        bash ./run_tests.sh
+        ./run_tests.sh
       shell: bash

README.md

@@ -67,7 +67,7 @@ script that is provided in this repository. This script makes use of the
 handles some special case examples (see
 [Validator Exceptions](#validator-exceptions)).
 
-Simply run `bash run_tests.sh` in a command line from the root of the
+Simply run `./run_tests.sh` in a command line from the root of the
 `bids-examples` repository.
 
 ### Validator exceptions
@@ -304,4 +304,4 @@ DO NOT EDIT DIRECTLY.
 |:------------------------------------------------------------------------------------------------------------|:--------------------------------------------------------------------------------------------|:--------------------------------|:-------------------------------------------------------------------------------------------------------------|:-------------------------------------------------|:-------------------------------------------|
 | [ds000117](https://github.com/bids-standard/bids-examples/tree/master/ds000117)                             | A multi-subject, multi-modal human neuroimaging dataset of 19 subjects on a MEG visual task | anat, beh, dwi, fmap, func, meg | T1w, beh, bold, channels, coordsystem, dwi, events, headshape, magnitude1, magnitude2, meg, phasediff, scans | [link](https://openneuro.org/datasets/ds000117/) | [@RikHenson](https://github.com/RikHenson) |
 | [eeg_ds003645s_hed_demo](https://github.com/bids-standard/bids-examples/tree/master/eeg_ds003645s_hed_demo) | Shows usage of Hierarchical Event Descriptor (HED) in .tsv files                            | eeg, beh                        | channels, eeg, events, participants, scans                                                                   | [link](https://openneuro.org/datasets/ds003645)  | [@VisLab](https://github.com/VisLab)       |
-| [synthetic](https://github.com/bids-standard/bids-examples/tree/master/synthetic)                           | A synthetic dataset                                                                         | anat, beh, func                 | T1w, beh, bold, events, physio, scans, sessions, stim                                                        | n/a                                              | [@effigies](https://github.com/effigies)   |
+| [synthetic](https://github.com/bids-standard/bids-examples/tree/master/synthetic)                           | A synthetic dataset                                                                         | anat, beh, func                 | T1w, beh, bold, events, physio, scans, sessions, stim                                                        | n/a                                              | [@effigies](https://github.com/effigies)   |

run_tests.sh

@@ -1,6 +1,6 @@
-#!/bin/bash
+#!/usr/bin/env bash
 
-rc = 0;
+rc=0;
 for i in $(ls -d */ | grep -v node_modules); do
     echo "Validating dataset" $i