Add tests for different Postgres client libraries (#2008)

* Add tests for different postgres clients
* test/fixtures: sanitize test name for test_output_dir
* test/fixtures: do not look for etcd before runtime
* Add workflow for testing Postgres client libraries

test_runner/pg_clients/python/asyncpg/Dockerfile

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+FROM python:3.10
+WORKDIR /source
+
+COPY . .
+
+RUN python3 -m pip install --no-cache-dir -r requirements.txt
+
+CMD ["python3", "asyncpg_example.py"]

test_runner/pg_clients/python/asyncpg/asyncpg_example.py

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+#! /usr/bin/env python3
+
+import asyncio
+import os
+
+import asyncpg
+
+
+async def run(**kwargs) -> asyncpg.Record:
+    conn = await asyncpg.connect(
+        **kwargs,
+        statement_cache_size=0,  # Prepared statements doesn't work pgbouncer
+    )
+    rv = await conn.fetchrow("SELECT 1")
+    await conn.close()
+
+    return rv
+
+
+if __name__ == "__main__":
+    kwargs = {
+        k.lstrip("NEON_").lower(): v
+        for k in ("NEON_HOST", "NEON_DATABASE", "NEON_USER", "NEON_PASSWORD")
+        if (v := os.environ.get(k, None)) is not None
+    }
+
+    loop = asyncio.new_event_loop()
+    row = loop.run_until_complete(run(**kwargs))
+
+    print(row[0])

test_runner/pg_clients/python/asyncpg/requirements.txt

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+asyncpg==0.25.0

test_runner/pg_clients/python/pg8000/Dockerfile

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+FROM python:3.10
+WORKDIR /source
+
+COPY . .
+
+RUN python3 -m pip install --no-cache-dir -r requirements.txt
+
+CMD ["python3", "pg8000_example.py"]

test_runner/pg_clients/python/pg8000/pg8000_example.py

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+#! /usr/bin/env python3
+
+import os
+import ssl
+
+import pg8000.dbapi
+
+if __name__ == "__main__":
+    kwargs = {
+        k.lstrip("NEON_").lower(): v
+        for k in ("NEON_HOST", "NEON_DATABASE", "NEON_USER", "NEON_PASSWORD")
+        if (v := os.environ.get(k, None)) is not None
+    }
+    conn = pg8000.dbapi.connect(
+        **kwargs,
+        ssl_context=True,
+    )
+
+    cursor = conn.cursor()
+    cursor.execute("SELECT 1")
+    row = cursor.fetchone()
+    print(row[0])
+    conn.close()

test_runner/pg_clients/python/pg8000/requirements.txt

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+pg8000==1.29.1