update armv7 to ubuntu 20.04

.github/workflows/build_arm.yaml

@@ -24,7 +24,7 @@ jobs:
           - arch: aarch64
             distro: ubuntu20.04
           - arch: armv7
-            distro: ubuntu18.04
+            distro: ubuntu20.04
     steps:
       - uses: actions/checkout@v3
         with:
@@ -57,9 +57,7 @@ jobs:
           # builds don't have to re-install them. The image layer is cached
           # publicly in your project's package repository, so it is vital that
           # no secrets are present in the container state or logs.
-          install: |
-            apt-get update -q -y
-            apt-get install -q -y libusb-1.0-0-dev libbz2-dev libzstd-dev pkg-config cmake libssl-dev g++ zlib1g-dev git libtinyxml2-dev
+          install: apt-get update -q -y; apt-get install -q -y libusb-1.0-0-dev libbz2-dev libzstd-dev pkg-config cmake libssl-dev g++ zlib1g-dev git libtinyxml2-dev
 
           # Produce a binary artifact and place it in the mounted volume
           run: |