Don't push docker images and don't push git tag in DMAKE_K8S_DRY_RUN=1 mode

[thomas-riccardi]

It is both useless and dangerous:

When deploying locally the docker image tag is always the same for a given branch, so it effectively overwrites an image that is used in the remote env, and it may be unexpectedly applied on the next pod creation (for example during a nodepool upgrade).

When using dry-run mode we expect no remote state change at all.

Same issue for the final git tag push.

[thomas-riccardi]

Current workaround:

• run DMAKE_ON_BUILD_SERVER=1 dmake deploy...
• manually edit the generated DMakefile to remove the dmake_push_docker_image "deepomatic/xxx:dev-0" "1" line near the end of the file, as well as the last 2 lines git tag and git push
• then run DMAKE_K8S_DRY_RUN=1 bash ./DMakefile