chore(ci): enable retries for choco installations

scripts/environment/bootstrap-windows-2019.ps1

@@ -12,6 +12,9 @@ if ($env:RELEASE_BUILDER -ne "true") {
     rustup run stable cargo install cargo-nextest --version 0.9.72 --locked
 }
 
+# Enable retries to avoid transient network issues.
+export NUGET_ENABLE_ENHANCED_HTTP_RETRY=true
+
 # Install some required dependencies / tools.
 choco install make
 choco install protoc

scripts/util/retry.sh

@@ -0,0 +1,58 @@
+#!/bin/bash
+
+# Usage: ./retry.sh -r <max_retries> -d <delay_in_seconds> -c "<command>"
+# Example: ./retry.sh -r 5 -d 30 -c "choco install protoc"
+
+max_retries=3
+delay=10
+command=""
+
+# Parse options
+while getopts "r:d:c:" opt; do
+  case $opt in
+    r)
+      max_retries=$OPTARG
+      ;;
+    d)
+      delay=$OPTARG
+      ;;
+    c)
+      command=$OPTARG
+      ;;
+    \?)
+      echo "Invalid option: -$OPTARG" >&2
+      exit 1
+      ;;
+    :)
+      echo "Option -$OPTARG requires an argument." >&2
+      exit 1
+      ;;
+  esac
+done
+
+# Check if command is provided
+if [[ -z "$command" ]]; then
+  echo "Usage: $0 -r <max_retries> -d <delay_in_seconds> -c \"<command>\""
+  exit 1
+fi
+
+attempt=1
+
+while [[ $attempt -le $max_retries ]]; do
+  echo "Attempt $attempt to run: $command"
+
+  if eval "$command"; then
+    echo "Command succeeded on attempt $attempt."
+    exit 0
+  else
+    echo "Attempt $attempt failed. Retrying in $delay seconds..."
+    ((attempt++))
+    sleep $delay
+    delay=$((delay * 2))  # Exponential backoff (increase delay each time)
+  fi
+
+  if [[ $attempt -gt $max_retries ]]; then
+    echo "Command failed after $max_retries attempts."
+    exit 1
+  fi
+done