ci: Add PGXN META.json and release workflow

.gitattributes

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+.gitignore export-ignore
+.gitattributes export-ignore
+.github export-ignore
+.markdownlint.yaml export-ignore
+.pre-commit-config.yaml export-ignore
+META.json.in export-ignore

.github/workflows/publish-pg_analytics-pgxn.yml

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+# workflows/publish-pg_analytics-pgxn.yml
+#
+# Publish pg_analytics (PGXN)
+# Build and publish the pg_analytics extension to the PostgreSQL Extension Network (PGXN).
+
+name: Publish pg_analytics (PGXN)
+
+on:
+  push:
+    tags:
+      - "v*"
+  workflow_dispatch:
+
+jobs:
+  publish-pg_analytics:
+    name: Publish pg_analytics to PGXN
+    runs-on: ubuntu-latest
+    container: pgxn/pgxn-tools
+
+    steps:
+      - name: Checkout Git Repository
+        uses: actions/checkout@v4
+
+      - name: Bundle the Release
+        run: make dist
+
+      - name: Release on PGXN
+        env:
+          PGXN_USERNAME: ${{ secrets.PGXN_USERNAME }}
+          PGXN_PASSWORD: ${{ secrets.PGXN_PASSWORD }}
+        run: pgxn-release

META.json.in

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+{
+   "name": "pg_analytics",
+   "abstract": "DuckDB-powered data lake analytics from Postgres",
+   "description": "pg_analytics puts DuckDB inside Postgres. With pg_analytics installed, Postgres can query foreign object stores like AWS S3 and table formats like Iceberg or Delta Lake. Queries are pushed down to DuckDB, a high-performance analytical query engine.",
+   "version": "@CARGO_VERSION@",
+   "maintainer": [
+      "ParadeDB <[email protected]>"
+   ],
+   "license": "postgresql",
+   "provides": {
+      "pg_analytics": {
+         "abstract": "DuckDB-powered data lake analytics from Postgres",
+         "file": "src/lib.rs",
+         "docfile": "doc/overview.mdx",
+         "version": "@CARGO_VERSION@"
+      }
+   },
+   "prereqs": {
+      "runtime": {
+         "requires": {
+            "PostgreSQL": "13.0.0"
+         }
+      }
+   },
+   "resources": {
+      "bugtracker": {
+         "web": "https://github.com/paradedb/pg_analytics/issues/"
+      },
+      "repository": {
+         "url": "git://github.com/paradedb/pg_analytics.git",
+         "web": "https://github.com/paradedb/pg_analytics/",
+         "type": "git"
+      }
+   },
+   "generated_by": "David E. Wheeler",
+   "meta-spec": {
+      "version": "1.0.0",
+      "url": "https://pgxn.org/meta/spec.txt"
+   },
+   "tags": [
+      "paradedb",
+      "analytics",
+      "big data",
+      "olap",
+      "parquet",
+      "iceberg",
+      "object storage",
+      "datalake",
+      "arrow",
+      "realtime analytics",
+      "columnar",
+      "duckdb"
+   ]
+}

Makefile

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+DISTNAME = $(shell grep -m 1 '^name' Cargo.toml | sed -e 's/[^"]*"\([^"]*\)",\{0,1\}/\1/')
+DISTVERSION  = $(shell grep -m 1 '^version' Cargo.toml | sed -e 's/[^"]*"\([^"]*\)",\{0,1\}/\1/')
+
+META.json: META.json.in Cargo.toml
+	@sed "s/@CARGO_VERSION@/$(DISTVERSION)/g" $< > $@
+
+$(DISTNAME)-$(DISTVERSION).zip: META.json
+	git archive --format zip --prefix $(DISTNAME)-$(DISTVERSION)/ --add-file $< -o $(DISTNAME)-$(DISTVERSION).zip HEAD
+
+dist: $(DISTNAME)-$(DISTVERSION).zip
+
+clean:
+	@rm -rf META.json $(DISTNAME)-$(DISTVERSION).zip