Add retries to snap build (#314273)

* Add retries around snap build commands.

Co-authored-by: Copilot <copilot@github.com>

Author: dmitrivMS

build/azure-pipelines/linux/apt-retry.sh

@@ -29,6 +29,12 @@ while [ $i -le 30 ];do
   elif grep -q 'dpkg frontend is locked by another process' $err;then
     # dpkg process is busy by another process
     retry=true
+  elif grep -q 'Failed to fetch' $err;then
+    # transient network issue when downloading packages
+    retry=true
+  elif grep -q 'Unable to fetch some archives' $err;then
+    # transient network issue when downloading packages
+    retry=true
   fi
 
   rm $err

build/azure-pipelines/linux/build-snap.sh

@@ -4,6 +4,10 @@ set -e
 # Get snapcraft version
 snapcraft --version
 
+# Configure apt to retry on transient network failures
+# This applies to both the apt commands below and snapcraft's internal apt operations for stage-packages
+sudo sh -c 'echo "Acquire::Retries \"5\";" > /etc/apt/apt.conf.d/80-retries'
+
 # Make sure we get latest packages
 sudo apt-get update
 sudo apt-get upgrade -y