Fix build error

Use self-hosted machine for ARM docker build.

.github/workflows/docker.yml

@@ -142,7 +142,7 @@ jobs:
 
   armv7_build:
     name: Build ARMv7 Image
-    runs-on: ubuntu-latest
+    runs-on: [self-hosted, linux, ARM64]
     steps:
       - name: Checkout base
         uses: actions/checkout@v2
@@ -215,7 +215,7 @@ jobs:
 
   arm64_build:
     name: Build ARM64 Image
-    runs-on: ubuntu-latest
+    runs-on: [self-hosted, linux, ARM64]
     steps:
       - name: Checkout base
         uses: actions/checkout@v2