#1807 Remove extra steps in custom_build

.github/workflows/custom_build.yml

@@ -38,8 +38,7 @@ jobs:
       - name: install packages
         run: |
           sudo apt-get -y remove libzmq* || true
-          sudo apt-get -y install software-properties-common
-          sudo apt-get -y install gcc-9 g++-9
+          sudo apt-get -y install software-properties-common gcc-9 g++-9 || true
 
       - name: Use g++-9 and gcov-9 by default
         run: |
@@ -83,8 +82,6 @@ jobs:
           rm -rf ./libconsensus || true
           ls -1
           git submodule update --init --recursive 
-      - name: update apt
-        run: sudo add-apt-repository ppa:ubuntu-toolchain-r/test;
 
       - name: Prepare ccache timestamp
         id: ccache_cache_timestamp