ci: pass TEST_RUN_RETRIES=3 to environment

We have recently turned off retrying test runs after a failure for
improving developer experience on using test-run on local machines.
Now to enable tests auto-rerun on CI let's pass TEST_RUN_RETRIES=3
to environment.

NO_DOC=ci
NO_TEST=ci
NO_CHANGELOG=ci

.github/actions/environment/action.yml

@@ -5,11 +5,12 @@ runs:
   steps:
     - run: |
         echo VARDIR=/tmp/tnt | tee -a $GITHUB_ENV
+        echo TEST_RUN_RETRIES=3 | tee -a $GITHUB_ENV
         echo SERVER_START_TIMEOUT=290 | tee -a $GITHUB_ENV
         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=SERVER_START_TIMEOUT,REPLICATION_SYNC_TIMEOUT,TEST_TIMEOUT,NO_OUTPUT_TIMEOUT | tee -a $GITHUB_ENV
+        echo PRESERVE_ENVVARS=TEST_RUN_RETRIES,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