SKALE-2202 add docker password and username

.github/workflows/dockerimagesim.yml

@@ -3,6 +3,9 @@ on: [push]
 jobs:
   build:
     runs-on: ubuntu-latest
+    env:
+        DOCKER_USERNAME: ${{ secrets.DOCKER_USERNAME }}
+        DOCKER_PASSWORD: ${{ secrets.DOCKER_PASSWORD }}
     steps:
     - name: Check that /dev/urandom exists
       run: ls /dev/urandom