Update build.yaml

.github/workflows/build.yaml

@@ -9,14 +9,16 @@ on:
 jobs:
   build:
     runs-on: ubuntu-18.04
-    shell: bash
     strategy:
       matrix:
         arch: [linux/386, linux/amd64, linux/arm/v6, linux/arm/v7, linux/arm64, linux/ppc64le]
 
     steps:
       - name: Install sudo package
-        run: apt-get update && apt-get install -y sudo
+        run: |
+          (apt-get update || true) 2>/dev/null
+          (apt-get install -y sudo) 2>/dev/null
+          sudo apt update
       - uses: actions/checkout@v2
         with:
           submodules: "recursive"