readd check for tabs in sources

.github/workflows/tab_check.yml

@@ -0,0 +1,20 @@
+# This starter workflow is for a CMake project running on multiple platforms. There is a different starter workflow if you just want a single platform.
+# See: https://github.com/actions/starter-workflows/blob/main/ci/cmake-single-platform.yml
+name: Check for Tabs
+
+on:
+  push:
+    branches: [ "release", "develop", "freeze" ]
+  pull_request:
+    branches: [ "release", "develop", "freeze" ]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    container: quay.io/eclipse4diac/4diac-fortebuildcontainer:latest
+
+    steps:
+    - uses: actions/[email protected]
+
+    - name: Test for Tabs
+      run: tests/findTabs.sh

tests/findTabs.sh

@@ -1,3 +1,4 @@
+#!/bin/bash
 
 if [ "$WORKSPACE" == "" ]
 then 
@@ -13,7 +14,7 @@ do
   echo $folder
 done
 
-FOUND_TABS=$(grep -r "$(printf '\t')" $FOLDERS) #using -P with grep gave the error: invalid UTF-8 byte sequence in input
+FOUND_TABS=$(grep -r --include \*.h --include \*.cpp "$(printf '\t')" $FOLDERS) #using -P with grep gave the error: invalid UTF-8 byte sequence in input
 
 
 if [ "$FOUND_TABS" == "" ]