More CI work for Raspbian (#2949)

* More CI work for Raspbian

* Workaround quirks of Arm64/debian runners

.github/workflows/main_matrix.yml

@@ -103,7 +103,6 @@ jobs:
   build-nrf52:
     strategy:
       fail-fast: false
-      max-parallel: 2
       matrix:
         include:
           - board: rak4631
@@ -210,7 +209,14 @@ jobs:
   gather-artifacts:
     runs-on: ubuntu-latest
     needs:
-      [build-esp32, build-esp32-s3, build-nrf52, build-native, build-rpi2040]
+      [
+        build-esp32,
+        build-esp32-s3,
+        build-nrf52,
+        build-raspbian,
+        build-native,
+        build-rpi2040,
+      ]
     steps:
       - name: Checkout code
         uses: actions/checkout@v3