.github: fix parallel selection for workflow call

Signed-off-by: Richard Alpe <[email protected]>

Author: rical

.github/workflows/build.yml

@@ -55,6 +55,8 @@ jobs:
   build:
     name: Build ${{ github.event_name == 'workflow_dispatch' && github.event.inputs.name || inputs.name }} ${{ github.event_name == 'workflow_dispatch' && github.event.inputs.target || inputs.target }}
     runs-on: [ self-hosted, latest ]
+    env:
+      PARALLEL: ${{ github.event_name == 'workflow_dispatch' && github.event.inputs.parallel == 'true' || github.event_name != 'workflow_dispatch' && inputs.parallel == true }}
     strategy:
       fail-fast: false
     outputs:
@@ -126,7 +128,7 @@ jobs:
         id: parallel
         run: |
 
-          if [ "${{ ((github.event.inputs.parallel == 'true' && github.event_name == 'workflow_dispatch') || (github.ref_name != 'main' && github.event_name != 'workflow_dispatch')) }}" == "true" ]; then
+          if [ "$PARALLEL" == "true" ]; then
              echo "BR2_PER_PACKAGE_DIRECTORIES=y" >> output/.config
              MAKE="make -j$((`getconf _NPROCESSORS_ONLN` / 2 + 2))"
              echo "Building in parallel with -j$((`getconf _NPROCESSORS_ONLN` / 2 + 2))"