make the run posix compatible for the container

Author: popmonkey

.github/workflows/linux-build.yml

@@ -69,11 +69,11 @@ jobs:
       - name: Determine Artifact Name
         id: artifact
         run: |
-          if [[ "${{ inputs.platform }}" == "linux" && "${{ inputs.arch }}" == "x64" ]]; then
-            echo "zip_name=highs-v1.12.0-linux-x64.zip" >> $GITHUB_OUTPUT
+          if [ "${{ inputs.platform }}" = "linux" ] && [ "${{ inputs.arch }}" = "x64" ]; then
+            echo "zip_name=highs-v1.12.0-linux-x64.zip" >> "$GITHUB_OUTPUT"
           else
-             echo "Error: Unsupported Platform/Arch combination: ${{ inputs.platform }} ${{ inputs.arch }}"
-             exit 1
+            echo "Error: Unsupported Platform/Arch combination: ${{ inputs.platform }} ${{ inputs.arch }}"
+            exit 1
           fi
 
       - name: Download HiGHS Artifact