feat(kube_pg_cluster): support custom_image

[wesbragagt]

Support building a custom postgres image in order to allow adding extensions for example pg_duckdb and pg_vector.

TODO:

• Test in a real cluster

---

Important

Adds support for custom PostgreSQL images with extensions by introducing pg_custom_image variable and updating image selection logic.

• Behavior:
  • Adds support for custom PostgreSQL images with extensions by introducing pg_custom_image variable in vars.tf.
  • Modifies imageName logic in main.tf to use pg_custom_image if set, otherwise defaults to pg_version.
• Documentation:
  • Updates README.md with instructions for using pre-built and custom PostgreSQL images, including building custom images with Docker Bake.
  • Lists available extensions and provides warnings about using custom images.

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[ellipsis-dev]

Important

Looks good to me! 👍

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1. packages/infrastructure/kube_pg_cluster/README.md:19

• Draft comment:
  Custom image documentation looks clear and comprehensive. All examples and warnings are well presented.
• Reason this comment was not posted:
  Confidence changes required: 0% <= threshold 50% None

2. packages/infrastructure/kube_pg_cluster/main.tf:283

• Draft comment:
  The conditional image selection using 'pg_custom_image' is correctly implemented. Consider also checking for an empty string in addition to null if that case is possible.
• Reason this comment was not posted:
  Confidence changes required: 33% <= threshold 50% None

3. packages/infrastructure/kube_pg_cluster/vars.tf:17

• Draft comment:
  The 'pg_custom_image' variable is well documented. Optionally, add validation to ensure a non-empty string if provided.
• Reason this comment was not posted:
  Confidence changes required: 33% <= threshold 50% None

Workflow ID: wflow_rKfQMIzrhWmfDLX7

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