add first_last_agg extension

Signed-off-by: Tobias Florek <me@ibotty.net>

Author: ibotty

first-last-agg/Dockerfile

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+ARG BASE=ghcr.io/cloudnative-pg/postgresql:18-minimal-trixie
+FROM $BASE AS builder
+
+ARG PG_MAJOR
+ARG EXT_VERSION
+
+USER 0
+
+RUN apt-get update && \
+	apt-get install -y --no-install-recommends "postgresql-${PG_MAJOR}-first-last-agg=${EXT_VERSION}"
+
+FROM scratch
+ARG PG_MAJOR
+
+# Licenses
+COPY --from=builder /usr/share/doc/postgresql-${PG_MAJOR}-first-last-agg/copyright /licenses/postgresql-${PG_MAJOR}-first-last-agg/
+
+# Libraries
+COPY --from=builder /usr/lib/postgresql/${PG_MAJOR}/lib/first_last_agg* /lib/
+COPY --from=builder /usr/lib/postgresql/${PG_MAJOR}/lib/bitcode/ /lib/bitcode/
+
+# Share
+COPY --from=builder /usr/share/postgresql/${PG_MAJOR}/extension/first_last_agg* /share/extension/
+
+USER 65532:65532

first-last-agg/README.md

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+# First-Last-Agg
+
+[First-Last-Agg](https://github.com/wulczer/first_last_agg) is a simple
+extension providing two aggregate functions, last and first aggregate
+functions, operating on any element type and returning the last or the first
+value of the group.
+
+This image provides a convenient way to deploy and manage `first_last_agg` with
+[CloudNativePG](https://cloudnative-pg.io/).
+
+## Usage
+
+### 1. Add the first_last_agg extension image to your Cluster
+
+Define the `first_last_agg` extension under the `postgresql.extensions` section of
+your `Cluster` resource. For example:
+
+```yaml
+apiVersion: postgresql.cnpg.io/v1
+kind: Cluster
+metadata:
+  name: cluster-first-last-agg
+spec:
+  imageName: ghcr.io/cloudnative-pg/postgresql:18-minimal-trixie
+  instances: 1
+
+  storage:
+    size: 1Gi
+
+  postgresql:
+    extensions:
+    - name: first_last_agg
+      image:
+        # renovate: suite=trixie-pgdg depName=postgresql-18-first-last-agg
+        reference: ghcr.io/cloudnative-pg/first-last-agg:0.8.2-18-trixie
+```
+
+### 2. Enable the extension in a database
+
+You can install `first_last_agg` in a specific database by creating or updating a
+`Database` resource. For example, to enable it in the `app` database:
+
+```yaml
+apiVersion: postgresql.cnpg.io/v1
+kind: Database
+metadata:
+  name: cluster-first-last-agg-app
+spec:
+  name: app
+  owner: app
+  cluster:
+    name: cluster-first-last-agg
+  extensions:
+  - name: first_last_agg
+    # renovate: suite=trixie-pgdg depName=postgresql-18-first-last-agg extractVersion=^(?<version>\d+\.\d+\.\d+)
+    version: '0.8.2'
+```
+
+### 3. Verify installation
+
+Once the database is ready, connect to it with `psql` and run:
+
+```sql
+\dx
+```
+
+You should see `first_last_agg` listed among the installed extensions.

first-last-agg/metadata.hcl

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+metadata = {
+  name                     = "first-last-agg"
+  sql_name                 = "first_last_agg"
+  image_name               = "first-last-agg"
+  licenses                 = ["PostgreSQL"]
+  shared_preload_libraries = []
+  postgresql_parameters    = {}
+  extension_control_path   = []
+  dynamic_library_path     = []
+  ld_library_path          = []
+  bin_path                 = []
+  env                      = {}
+  auto_update_os_libs      = false
+  required_extensions      = []
+  create_extension         = true
+
+  versions = {
+    bookworm = {
+      "18" = {
+        // renovate: suite=bookworm-pgdg depName=postgresql-18-first-last-agg
+        package = "0.1.4-4-gd63ea3b-9.pgdg12+1"
+        // renovate: suite=bookworm-pgdg depName=postgresql-18-first-last-agg extractVersion=^(?<version>\d+\.\d+\.\d+)
+        sql     = "0.1.4"
+      }
+    }
+    trixie = {
+      "18" = {
+        // renovate: suite=trixie-pgdg depName=postgresql-18-first-last-agg
+        package = "0.1.4-4-gd63ea3b-9.pgdg13+1"
+        // renovate: suite=trixie-pgdg depName=postgresql-18-first-last-agg extractVersion=^(?<version>\d+\.\d+\.\d+)
+        sql     = "0.1.4"
+      }
+    }
+  }
+}