chore(goreleaser): migrate from dockers/docker_manifests to dockers_v2

[sundereshwar]

What does this PR do / why do we need it?

GoReleaser deprecated the old dockers and docker_manifests configuration. This PR migrates our Docker image configuration for beegfs-watch to the new dockers_v2 format.

Related Issue(s)

#254

This PR may also resolve this issue ticket
https://github.com/ThinkParQ/bee-watch/issues/31

Where should the reviewer(s) start reviewing this?

Only required for larger PRs when this may not be immediately obvious.

Are there any specific topics we should discuss before merging?

Not required.

What are the next steps after this PR?

Not required.

Checklist before merging:

Required for all PRs.

When creating a PR these are items to keep in mind that cannot be checked by GitHub actions:

• Documentation:
  • Does developer documentation (code comments, readme, etc.) need to be added or updated?
  • Does the user documentation need to be expanded or updated for this change?
• Testing:
  • Does this functionality require changing or adding new unit tests?
  • Does this functionality require changing or adding new integration tests?
• Git Hygiene:
  • Do commits adhere to Conventional Commits?
  • Is the commit history squashed down reasonably?

For more details refer to the Go coding standards and the pull request process.

[sundereshwar]

Created #256 to resolve the CI Pipeline checks failure
Waiting to be merged.