Restore packer pkg

[samrose]

We should not have removed packer package, so that we can control the version, and to avoid non-free license errors.

Summary by CodeRabbit

• Chores
  • Updated PostgreSQL 17 to 17.6.1.078
  • Updated PostgreSQL 15 to 15.14.1.078
  • Updated PostgreSQL with OrioLeDB to 17.6.0.035-orioledb
• New Features
  • Added a packaged Packer tool to the build environment
  • Switched AMI and base-image workflows to use the new Packer packaging/source for builds

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[jchancojr]

LGTM

[coderabbitai]

📝 Walkthrough

Walkthrough

Adds a local Nix package for HashiCorp Packer (v1.14.1) at nix/packages/packer.nix, exports it via nix/packages/default.nix, and injects it into the build-ami and build-test-ami invocations. CI workflows (.github/workflows/ami-release-nix.yml, .github/workflows/base-image-nightly.yml) are changed to source packer via github:supabase/postgres/${GIT_SHA}#packer instead of nixpkgs#packer. Bumps three Postgres-related version strings in ansible/vars.yml (postgresorioledb-17, postgres17, postgres15).

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~25 minutes

Possibly related PRs

• fix: packer pkg dropped using upstream #2030: Modifies the same workflows and packer handling; directly related to packer source changes.
• feat: add branch-based versioning for PR AMI builds #1910: Touches AMI build workflow steps that invoke packer; related to workflow packer invocation changes.

Suggested labels

ci, nix, infrastructure

Suggested reviewers

• hunleyd
• LGUG2Z
• Crispy1975

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 inconclusive)

Check name	Status	Explanation	Resolution
Description check	❓ Inconclusive	The description is brief but clearly explains the rationale (control version, avoid license errors). However, the repository template requires selecting a sub-template, which appears incomplete.	Select and complete the appropriate description template (Default or Extension Upgrade) with all required sections rather than providing only a brief statement.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'Restore packer pkg' directly relates to the main change: reintroducing the packer package to control its version and avoid license errors.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch restore-packer-pkg

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