Fallback composer installs to source in CI

scripts/php-ci-test.sh

@@ -68,6 +68,22 @@ retry_command() {
   done
 }
 
+composer_install() {
+  dist_attempts="${PHP_CI_COMPOSER_RETRIES:-3}"
+  source_attempts="${PHP_CI_COMPOSER_SOURCE_RETRIES:-2}"
+
+  if retry_command "$dist_attempts" \
+    docker compose $compose_files exec -T php1 sh -lc \
+    'cd /var/www/html && composer install --no-interaction --prefer-dist --no-progress'; then
+    return 0
+  fi
+
+  echo "Composer dist install failed after ${dist_attempts} attempts; retrying with --prefer-source." >&2
+  retry_command "$source_attempts" \
+    docker compose $compose_files exec -T php1 sh -lc \
+    'cd /var/www/html && composer install --no-interaction --prefer-source --no-progress'
+}
+
 cleanup() {
   status="$?"
   collect_logs "$status"
@@ -112,9 +128,7 @@ tar \
   -C services/nginx/app -cf - . \
   | docker compose $compose_files exec -T php1 tar -C /var/www/html -xf -
 
-retry_command "${PHP_CI_COMPOSER_RETRIES:-3}" \
-  docker compose $compose_files exec -T php1 sh -lc \
-  'cd /var/www/html && composer install --no-interaction --prefer-dist --no-progress'
+composer_install
 
 docker compose $compose_files exec -T php1 sh -lc \
   "cd /var/www/html && composer test:ci:$suite"