Merge pull request #492 from OPNA2608/fix/ci_multithreading

Fix multithreading on CI

.github/workflows/build.yml

@@ -93,14 +93,10 @@ jobs:
       id: build-cores
       run: |
         # https://docs.github.com/en/actions/using-github-hosted-runners/about-github-hosted-runners#supported-runners-and-hardware-resources
-        set amount=2
+        amount=2
         if [ '${{ runner.os }}' == 'macOS' ]; then
           amount=3
         fi
-        # the Actions runner does not seem to be happy with two jobs at once on MinGW/Ubuntu
-        if [ '${{ runner.os }}' == 'Linux' ]; then
-          amount=1
-        fi
 
         echo "Amount of cores we can build with: ${amount}"