Minor fixes to terraform skill

[yeshwanth1993]

Fixes #<issue_number_goes_here>

It's a good idea to open an issue first for discussion.

• Tests pass
• Appropriate changes to documentation are included in the PR

[gemini-code-assist]

Summary of Changes

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This pull request significantly enhances the implementation phase within the CI/CD design process by introducing more flexible execution paths, including a dedicated Terraform workflow. It also refines existing skill documentation to improve clarity, enforce best practices, and provide more robust guidance for cloud infrastructure provisioning and management.

Highlights

• Enhanced Implementation Strategy: The gcp-cicd-design skill now offers users a choice between Terraform-based and Direct Implementation methods for executing approved YAML plans, providing detailed protocols for each approach.
• Terraform Skill Refinements: The terraform-gcp-skill documentation has been updated with a new version, clearer guidance on GCS backend usage, a stronger warning against google_project_iam_policy, and an updated recommended directory structure.
• Documentation Clarity: Minor documentation improvements were made across other skills, including adding a version to cloud-deploy-pipelines and emphasizing multi-stage Docker builds.

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Changelog

• skills/cloud-deploy-pipelines/SKILL.md
  • Added version 0.1.0 to the skill metadata.
• skills/gcp-cicd-design/SKILL.md
  • Revised the 'Plan Implementation' stage to introduce a choice between Terraform and Direct Implementation methods.
  • Detailed the execution steps for both Terraform (activating terraform-gcp-skill, HCL translation, execution protocol) and Direct Implementation (sequential processing, skill/tool leveraging, gcloud fallback).
  • Removed the 'Execution Mandate' section, which previously instructed immediate execution of the first workflow step.
• skills/gcp-cicd-design/references/how_to_write_dockerfile.md
  • Added a strong recommendation to always use multi-stage Docker builds when possible.
• skills/gcp-cicd-terraform/SKILL.md
  • Updated the terraform-gcp-skill version from 1.0.0 to 0.1.0.
  • Added a note to include local state directories in .gitignore when using a GCS backend.
  • Strengthened the warning against using google_project_iam_policy from 'Avoid' to 'Never use'.
  • Modified the recommended directory structure to include a terraform/ subdirectory.

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Code Review

The pull request introduces version metadata to the cloud-deploy-pipelines skill and updates it for the terraform-gcp-skill. It significantly refactors the gcp-cicd-design skill's implementation stage to offer users a choice between Terraform-based and direct implementation, detailing the steps for each, and removes a previous 'Execution Mandate'. Additionally, it emphasizes the use of multi-stage Docker builds, adds a .gitignore recommendation for local Terraform state, strengthens the warning against using google_project_iam_policy, and updates the recommended Terraform project structure to include a terraform/ subdirectory.