fix: packer pkg dropped using upstream

[samrose]

in previous work we dropped the packer package and use upstream. workflows needed to account for this too

Summary by CodeRabbit

• Chores
  • Updated PostgreSQL component versions for postgres15, postgres17, and postgresorioledb-17
  • Upgraded build infrastructure tooling configuration to use nixpkgs-based packaging

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[coderabbitai]

📝 Walkthrough

Walkthrough

This PR updates CI/CD workflows and version configurations. It replaces GitHub-hosted packer invocations with nixpkgs-based alternatives in two workflow files (ami-release-nix.yml and base-image-nightly.yml), and increments version numbers for three PostgreSQL packages in the ansible configuration file (postgresorioledb-17, postgres17, and postgres15).

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~5 minutes

Possibly related PRs

• feat: publish and use nix-catalog #1995: Modifies both the ami-release-nix.yml workflow and ansible/vars.yml version entries in the same areas as this PR.
• feat: add branch-based versioning for PR AMI builds #1910: Updates the AMI release workflow packer invocation steps in ami-release-nix.yml.
• feat(ansible): add pgBackRest tasks and configurations #1878: Updates the same postgres_release version strings in ansible/vars.yml.

Suggested labels

ci, infrastructure

Suggested reviewers

• jfroche
• staaldraad

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 inconclusive)

Check name	Status	Explanation	Resolution
Description check	❓ Inconclusive	The description briefly explains the context ('dropped the packer package and use upstream') and states what needs to be updated ('workflows needed to account for this'), but lacks specific details about what was changed in which files.	Consider adding specific details about which workflow files were modified and how the packer invocations were updated (e.g., from github:supabase/postgres to nixpkgs#packer).

✅ Passed checks (2 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title 'fix: packer pkg dropped using upstream' clearly and concisely summarizes the main change: replacing custom packer invocations with upstream nixpkgs packer across workflow files.
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 packer-fix

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