fix(ci): auto-derive PGXN version from git tag (#50)

* fix(ci): auto-derive PGXN version from git tag

META.json version was hardcoded at 0.1.7 and never updated, causing
the v0.3.1 PGXN release to fail with "already exists". Update to 0.3.1
and add a workflow step that rewrites META.json version from the git
tag before bundling, so future releases don't need manual bumps.

* chore: bump META.json version to 0.3.2 for next release

Author: amogiska

.github/workflows/pgxn.yml

@@ -10,6 +10,12 @@ jobs:
       - name: Check out the repo
         uses: actions/checkout@v4
         with: { submodules: recursive, fetch-depth: 0 }
+      - name: Set version from tag
+        if: startsWith( github.ref, 'refs/tags/v' )
+        run: |
+          VERSION="${GITHUB_REF#refs/tags/v}"
+          jq --arg v "$VERSION" '.version = $v | .provides.pg_stat_ch.version = $v' META.json > META.tmp
+          mv META.tmp META.json
       - name: Bundle the Release
         env: { GIT_ARCHIVE_CMD: archive-all }
         id: bundle

META.json

@@ -27,7 +27,7 @@
       "abstract": "PostgreSQL Query Telemetry Exporter to ClickHouse",
       "docfile": "README.md",
       "file": "pg_stat_ch.control",
-      "version": "0.1.7"
+      "version": "0.3.2"
     }
   },
   "resources": {
@@ -46,5 +46,5 @@
     "metrics",
     "clickhouse"
   ],
-  "version": "0.1.7"
+  "version": "0.3.2"
 }