chore(deps): update docker/metadata-action digest to c299e40

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
docker/metadata-action	action	digest	98669ae -> c299e40

---

Configuration

📅 Schedule: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

---

• If you want to rebase/retry this PR, check this box

---

This PR was generated by Mend Renovate. View the repository job log.

[github-actions]

Improvements:

1. Semantic Versioning for Actions:

   • You updated the Docker Metadata Action to a specific commit hash (418e4b98bf2841bd337d0b24fe63cb36dc8afa55). While pinning dependencies to deterministic versions is a good practice, using a commit hash may reduce maintainability as it's not easily readable. Instead, use a semantically versioned tag (e.g., v4.0.0) if the action provides one.
     • Example:
       yaml
       uses: docker/metadata-action@v4

2. Cost and Carbon Implications:

   • While this specific change does not directly affect costs or emissions, updating dependencies without thorough testing could lead to unexpected issues, increasing debugging cycles and CI runs. Ensure all workflows referencing this action are fully tested after updating.

3. Dependency Update Audit:

   • Check the changelog or release notes for docker/metadata-action to ensure the new version does not introduce breaking changes or deprecated functionality.
     • Action: Review documentation here.

4. YAML Anchors for Reusability:

   • If multiple workflows or steps use the same Docker metadata action, consider using YAML anchors to centralize version management.
     • Example:

       docker_metadata: &docker_metadata_version docker/metadata-action@v4
       
       jobs:
         example-job:
           steps:
             - uses: *docker_metadata_version

No cost or environmental impacts are directly measurable here, but maintaining optimum CI configurations minimizes resource wastage.

[github-actions]

Recommendations for Improvement

1. Pin versions using tags and SHAs for better clarity:

   • While the update pins the docker/metadata-action to a specific commit SHA (b798ed8388581f6f002541048b6458ca2c4ba442), include a comment explaining why this SHA is used and confirm the action's tag (e.g., v4.0.0) for clarity. Example:
     yaml
     • uses: docker/metadata-action@b798ed8 # Equivalent to version v4.0.0

2. Validate registry and image name inputs:

   • Currently, ${{ env.REGISTRY }} and ${{ env.IMAGE_NAME }} are used without validation or fallback defaults. Consider pre-validating these as separate steps or defaulting them to avoid failures. Example:

     env:
       REGISTRY: ${{ env.REGISTRY || 'defaultregistry.com' }}
       IMAGE_NAME: ${{ env.IMAGE_NAME || 'default-image' }}

3. Analyze cost and energy impact:

   • Since this action may trigger Docker builds, track build frequency to assess potential costs and energy consumption. Integrate caching strategies (e.g., layer caching) to reduce unnecessary rebuilds, improving both cost efficiency and carbon usage.

4. Security Review:

   • Ensure all secrets (e.g., Docker registry credentials) are stored securely via GitHub Secrets and not exposed in logs. Confirm env.REGISTRY and env.IMAGE_NAME don't inadvertently reveal sensitive info (e.g., private repo names).

5. Documentation Update:

   • If this workflow change affects other setup scripts or documentation, ensure they are updated to reflect this SHA upgrade and explain any new features or fixes the updated docker/metadata-action version introduces.