ci: add server start timeout to PRESERVE_ENVVARS

This change adds the server start timeout to the PRESERVE_ENVVARS
environment variable to deliver it to 'packpack' docker containers
while running packaging workflows.

NO_DOC=ci
NO_CHANGELOG=ci
NO_TEST=ci

(cherry picked from commit 9c7c675d)

.github/actions/environment/action.yml

@@ -9,7 +9,7 @@ runs:
         echo REPLICATION_SYNC_TIMEOUT=300 | tee -a $GITHUB_ENV
         echo TEST_TIMEOUT=310 | tee -a $GITHUB_ENV
         echo NO_OUTPUT_TIMEOUT=320 | tee -a $GITHUB_ENV
-        echo PRESERVE_ENVVARS=REPLICATION_SYNC_TIMEOUT,TEST_TIMEOUT,NO_OUTPUT_TIMEOUT | tee -a $GITHUB_ENV
+        echo PRESERVE_ENVVARS=SERVER_START_TIMEOUT,REPLICATION_SYNC_TIMEOUT,TEST_TIMEOUT,NO_OUTPUT_TIMEOUT | tee -a $GITHUB_ENV
         # Configure AWS Region to avoid of issue:
         #   https://github.com/tarantool/tarantool-qa/issues/111
         echo AWS_DEFAULT_REGION=MS | tee -a $GITHUB_ENV