Update firmware_build.yml

experiment with local GitHub runner

.github/workflows/firmware_build.yml

@@ -7,8 +7,10 @@ on:
 
 jobs:
   build_firmware:
-    name: Build firmware on Ubuntu 20.04
-    runs-on: ubuntu-20.04
+    name: RHC-internal
+    runs-on: self-hosted
+#    name: Build firmware on Ubuntu 20.04
+#    runs-on: ubuntu-20.04
     
     steps:
       - name: Check out code from GitHub