Update firmware_build.yml

.github/workflows/firmware_build.yml

@@ -7,8 +7,8 @@ on:
 
 jobs:
   build_firmware:
-    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
@@ -18,8 +18,8 @@ jobs:
           fetch-depth: "0"
       
       - name: Install platformio
-       run: |
-          pip install platformio
+        run: |
+          sudo pip install platformio
       
       - name: Build firmware
         run: |