fix syntax, not bash

Author: roiser

.github/workflows/mg5_codegen.yml

@@ -35,7 +35,7 @@ jobs:
           fi
       
       - name: Commit to target repository
-        if: [ "${{ steps.clang-format-check.outputs.format_exit }}" -eq "0" ]
+        if: "${{ steps.clang-format-check.outputs.format_exit }}" == "0"
         env:
           TARGET_REPO: roiser/madgraph4gpu-generated-processes
           GH_TOKEN: ${{ secrets.MG4GPU_GEN_PAT }} 
@@ -65,7 +65,7 @@ jobs:
           echo "✅ Pushed to ${TARGET_REPO} on branch ${BRANCH_NAME}"
       
       - name: Read patch file
-        if: [ "${{ steps.clang-format-check.outputs.format_exit }}" -ne "0" ]
+        if: "${{ steps.clang-format-check.outputs.format_exit }}" != "0"
         run: |
           {
             echo "patch_file_content<<EOF"
@@ -74,7 +74,7 @@ jobs:
           } >> $GITHUB_OUTPUT
 
       - name: Comment on PR with format issues
-        if: [ "${{ steps.clang-format-check.outputs.format_exit }}" -ne "0" ]
+        if: "${{ steps.clang-format-check.outputs.format_exit }}" != "0"
         uses: actions/github-script@v7
         with:
           script: |
@@ -97,5 +97,5 @@ jobs:
             });
       
       - name: Fail if format check failed
-        if: [ "${{ steps.clang-format-check.outputs.format_exit }}" -ne "0" ]
+        if: "${{ steps.clang-format-check.outputs.format_exit }}" != "0"
         run: exit 1