Add PGXN Meta.json and release workflow

.gitattributes

@@ -0,0 +1,4 @@
+.ci export-ignore
+.gitignore export-ignore
+.gitattributes export-ignore
+.github export-ignore

.github/workflows/pgxn-release.yml

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+name: ⚙️ Release on PGXN
+on:
+  push:
+    # Release on semantic version tag.
+    # tags: ['v[0-9]+.[0-9]+.[0-9]+']
+jobs:
+  release:
+    name: Release on PGXN
+    runs-on: ubuntu-latest
+    container: pgxn/pgxn-tools
+    steps:
+    - name: Check out the repo
+      uses: actions/checkout@v4
+    - name: Bundle the Release
+      run: pgxn-bundle
+    - name: Release on PGXN
+      env:
+        PGXN_USERNAME: ${{ secrets.PGXN_USERNAME }}
+        PGXN_PASSWORD: ${{ secrets.PGXN_PASSWORD }}
+      run: ls -lah # pgxn-release

.gitignore

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 *.iml
 **/*.rs.bk
 *.swp
+pg_jsonschema-*

META.json

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+{
+   "name": "pg_jsonschema",
+   "abstract": "PostgreSQL extension providing JSON Schema validation",
+   "description": "pg_jsonschema is a PostgreSQL extension adding support for JSON schema validation on json and jsonb data types.",
+   "version": "0.3.1",
+   "maintainer": [
+      "Oliver Rice <[email protected]>"
+   ],
+   "license": "apache_2_0",
+   "provides": {
+      "pg_jsonschema": {
+         "abstract": "PostgreSQL extension providing JSON Schema validation",
+         "file": "pg_jsonschema.control",
+         "docfile": "README.md",
+         "version": "0.3.1"
+      }
+   },
+   "prereqs": {
+      "runtime": {
+         "requires": {
+            "PostgreSQL": "12.0.0"
+         }
+      }
+   },
+   "resources": {
+      "bugtracker": {
+         "web": "https://github.com/supabase/pg_jsonschema/issues/"
+      },
+      "repository": {
+         "url": "git://github.com/supabase/pg_jsonschema.git",
+         "web": "https://github.com/supabase/pg_jsonschema/",
+         "type": "git"
+      }
+   },
+   "generated_by": "David E. Wheeler",
+   "meta-spec": {
+      "version": "1.0.0",
+      "url": "https://pgxn.org/meta/spec.txt"
+   },
+   "tags": [
+      "jsonschema",
+      "validation",
+      "json",
+      "jsonb"
+   ]
+}