Make apt update more robust adding sleeps betwen retries

Author: igaztanaga

.github/workflows/ci.yml

@@ -441,7 +441,9 @@ jobs:
                 echo "GHA_CONTAINER=${{matrix.container}}" >> $GITHUB_ENV
                 if [ -f "/etc/debian_version" ]
                 then
-                    apt-get -o Acquire::Retries=$NET_RETRY_COUNT update
+                    for i in $(seq 1 $NET_RETRY_COUNT); do
+                        apt-get update && break || sleep 5
+                    done
                     if [ "$(apt-cache search "^python-is-python3$" | wc -l)" -ne 0 ]
                     then
                         PYTHON_PACKAGE="python-is-python3"
@@ -507,7 +509,9 @@ jobs:
                     done
                 done
             fi
-            sudo apt-get -o Acquire::Retries=$NET_RETRY_COUNT update
+            for i in $(seq 1 $NET_RETRY_COUNT); do
+               apt-get update && break || sleep 5
+            done
             sudo apt-get -o Acquire::Retries=$NET_RETRY_COUNT install -y ${{join(matrix.install, ' ')}}
 
       - name: Setup GCC Toolchain