Update Octobot ArgoCD image strategy.

Change Summary

This commit modifies the ArgoCD application configuration for the octobot module, specifically updating the image update strategy from semver to digest.

Technical Details

• File Modified: IaC/modules/octobot/main.tf
• Change:
  • Updated the argocd-image-updater.argoproj.io/octobot.update-strategy annotation from semver to digest.
• Implementation:
  • The semver strategy updates the image based on semantic versioning rules, which can lead to updates when a new minor or patch version is released.
  • The digest strategy updates the image only when the container image digest changes, ensuring that the exact image is deployed consistently across environments.

Key Learnings & Insights

• Reasoning Behind Changes:
  • The change to the digest strategy ensures that the exact same image is deployed across all environments, reducing the risk of discrepancies due to different semantic versions.
• Problem-Solving Approach:
  • Identified inconsistency issues in deployments due to semantic version updates.
  • Decided on a more reliable update strategy that ensures image integrity and consistency.
• Best Practices:
  • Using image digests for updates is a best practice in CI/CD pipelines to maintain consistency and avoid unexpected behavior from minor version changes.
• Trade-offs:
  • While the digest strategy provides more reliability, it may require more frequent manual interventions to trigger updates, as opposed to automatic updates with semver.

Impact Assessment

• System Impact:
  • Ensures that the octobot application will always deploy the exact same image across all environments, improving consistency and reliability.
• Performance & Security:
  • No direct performance impact, but enhances security by ensuring that the deployed image is exactly what was tested and approved.
• Maintainability:
  • Simplifies troubleshooting by ensuring that the environment is consistent, reducing variables that could cause issues.

Developer Notes

• Gotchas:
  • Remember to update the image digest manually when a new image needs to be deployed.
• Edge Cases:
  • Ensure that the CI/CD pipeline is configured to handle image digest updates appropriately.
• Future Improvements:
  • Consider automating the process of updating image digests in a controlled manner to balance between automation and consistency.