Rework dev mode for stapel and dockerfile

• Werf creates temporary commits in the dev-mode.
• Files from the git index used in the dev-mode.
• Support dev-mode in conjunction with the follow-mode.
• Commit staged files to dev branch werf-dev-<commit>.
• Add werf-dev label to git stage images.

Change default werf images storage for GitLab CI/CD and GitHub Actions

• Remove /werf repo suffix for GitLab CI/CD;
• Remove -werf repo suffix for GitHub Actions.

NOTE. This is breaking change, incompatible with the previous werf versions.

Other

• Fix "list event error: context cancelled" log messages.
• [web] Update metainfo in page template.
• More fixes for werf-related ci tests.

Installation

Linux amd64

Darwin amd64

Windows amd64