ci: smoke test the published 0.3.0 release from PyPI on macOS

Temporary branch only: installs sqlquack 0.3.0 from PyPI on macOS 15 (Apple
Silicon and Intel) and runs the README Python example and time-zone-dependent
conversions.

Author: kvlonge

.github/pypi-smoke.sh

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+#!/bin/bash
+# PyPI smoke for a published sqlquack version: README Python example + time-zone-dependent convert/run.
+# Usage: smoke.sh <version> <policy.toml>
+set -euo pipefail
+V="$1"; POLICY="$(cd "$(dirname "$2")" && pwd)/$(basename "$2")"
+W="$(mktemp -d)"; "${PYTHON:-python3}" -m venv "$W/venv"; B="$W/venv/bin"
+"$B/python" -m pip install -q --no-cache-dir "sqlquack==$V"
+"$B/sqlquack" --version
+"$B/python" -c 'import sqlquack
+r = sqlquack.convert(sql="SELECT 1 AS total", options=sqlquack.ConvertOptions(builtin_policy=True))
+assert r.sql == "SELECT CAST(1 AS DECIMAL(1,0)) AS \"TOTAL\"", r.sql
+print("readme-python ok:", r.sql)'
+cd "$W"; cp "$POLICY" sqlquack.toml
+echo "SELECT '2024-03-10 22:30:00'::TIMESTAMP_NTZ(6)::TIMESTAMP_TZ AS placed_at" > tz.sql
+"$B/sqlquack" convert tz.sql
+out="$(TZ=America/New_York "$B/sqlquack" run tz.sql)"; echo "$out"; grep -q '^2024-03-10 22:30:00+00$' <<< "$out"
+echo "SELECT CONVERT_TIMEZONE('UTC', 'America/New_York', '2024-03-10 12:00:00'::TIMESTAMP_NTZ) AS local_at" > icu.sql
+out="$("$B/sqlquack" run icu.sql)"; echo "$out"; grep -q '^2024-03-10 08:00:00$' <<< "$out"
+echo "smoke ok: sqlquack $V on $(uname -sm)"

.github/workflows/pypi-smoke.yml

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+# Temporary: smoke test a published release from PyPI on macOS. Not for main.
+name: PyPI smoke
+on:
+  push:
+    branches: [smoke/pypi-macos]
+jobs:
+  smoke:
+    strategy:
+      fail-fast: false
+      matrix:
+        runner: [macos-15, macos-15-intel]
+    runs-on: ${{ matrix.runner }}
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
+        with:
+          python-version: "3.12"
+      - name: Install sqlquack 0.3.0 from PyPI and smoke test it
+        shell: bash
+        run: PYTHON=python bash .github/pypi-smoke.sh 0.3.0 sqlquack.toml