HOLI-9235 hide sensitive information from CI build logs

.gitlab-ci.yml

 default:
   before_script:
     - set -ex
-    - env
+    # env -0 | sort -z | tr '\0' '\n': Sort env output alphabetically, keeping multiline variables intact
+    # egrep: Remove sensitive information from the output of env
+    - env -0 | sort -z | tr '\0' '\n' | egrep -ve '^(DOCKER_AUTH_CONFIG|GOOGLE_APPLICATION_CREDENTIALS)=.*'
   interruptible: true
   tags:
     - 1cpu-4gb