feat: Add PostgreSQL 18 support

[ZPascal]

• Add Pg 18 support

Should be discussed:
Should we add PG 18 as default version?

[Alphasite]

I think this looks good to me. it looks similar to the other versions

[ZPascal]

@Alphasite Should we replace the default version to PG 18?

[Alphasite]

I think that’s reasonable. We’d probably want to also add it to BBR if we did that then? Chris, Colin and I just added PG 15, 16 and 17. 18 also seems reasonable.

[ZPascal]

I think that’s reasonable. We’d probably want to also add it to BBR if we did that then? Chris, Colin and I just added PG 15, 16 and 17. 18 also seems reasonable.

Hi @Alphasite, I also prefer it, but we should release it as a new major release.

We’d probably want to also add it to BBR if we did that then? Chris, Colin and I just added PG 15, 16 and 17. 18 also seems reasonable.

The BBR job already supports PG 15,16 and 17, and I've also replaced the default version to 18 inside the BBR job.

[Alphasite]

did you want to merge this version?

[ZPascal]

@Alphasite, I think we should first remove PG 11 and 13 from the release before we add a new version.

[ZPascal]

@colins Can you please check the PR?

[Alphasite]

I think it looks ok. I’m assuming it all compiles?

[ZPascal]

I think it looks ok. I’m assuming it all compiles?

Yes, but let me verify it on a Noble image. We've faced a few issues this week on Ubuntu 26.04.

[Copilot]

Pull request overview

Adds PostgreSQL 18 as a new packaged major version in this BOSH release, updates version-selection defaults/docs, and extends the CI pipeline to track/bump the new upstream source.

Changes:

• Add a new postgres-18 package (spec + packaging script) to build from upstream postgresql-18.*.tar.gz.
• Update job specs and the used_postgresql_versions.yml mapping to include Postgres 18 and set the default major version to 18.
• Extend the Concourse pipeline to fetch and bump the Postgres 18 source tarball.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
README.md	Updates documented default PostgreSQL major version and supported versions list.
packages/postgres-18/spec	Declares the new Postgres 18 source blob pattern.
packages/postgres-18/packaging	Adds build script for compiling/installing Postgres 18.
jobs/postgres/templates/used_postgresql_versions.yml	Adds Postgres 18 version mapping and changes default major version.
jobs/postgres/spec	Includes postgres-18 package and changes the default databases.version.
jobs/bbr-postgres-db/spec	Includes postgres-18 package and changes the default postgres.version.
ci/pipeline.yml	Adds postgres-18-src resource and a bump task for Postgres 18.

Comments suppressed due to low confidence (1)

jobs/postgres/templates/used_postgresql_versions.yml:7

• The 17 minor version is set to 17.4, but the repo’s current blob is postgres/postgresql-17.9.tar.gz (see config/blobs.yml). This mismatch can cause the release to reference a PostgreSQL version that isn’t available as a blob. Update used_postgresql_versions.yml to match the blob version (or add the corresponding blob) and remove the conflicting 17 entry.

    17:
      minor_version: "17.4"

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[ZPascal]

I think we can combine the bump and the default version update into a single pull request for the acceptance test and trigger the corresponding Concourse job to upload the PostgreSQL archive to the blob store before we build the new release version.