fix(trino): resolve the mapped host port in get_connection_url() (#1112)

Fixes #1111

### What's wrong

`TrinoContainer.get_connection_url()` builds the URL as
`trino://{user}@{host}:{self.port}`, and `self.port` is the fixed
container-internal port set in `__init__` (8080 by default) — never
resolved through `get_exposed_port()`. Since Docker maps that to a
random host port, the URL this method returns can't actually connect to
anything.

The existing test (`test_docker_run_trino`) didn't catch this because it
bypasses `get_connection_url()` entirely, connecting via
`trino.dbapi.connect()` with an explicitly resolved
`get_exposed_port(trino.port)` instead.

### The fix

One-line change, matching the pattern `CockroachDBContainer` and
`CrateDBContainer` already use via `_create_connection_url()`:

```diff
     def get_connection_url(self):
-        return f"trino://{self.user}@{self.get_container_host_ip()}:{self.port}"
+        return f"trino://{self.user}@{self.get_container_host_ip()}:{self.get_exposed_port(self.port)}"
```

Also added `test_get_connection_url`, which actually exercises
`get_connection_url()` via SQLAlchemy (the way a real user would use
it), matching the sibling `cockroachdb`/`cratedb` tests' pattern. Ran
locally against a real container — passes with the fix, and the bug is
reproducible by inspection: `trino.port` and
`trino.get_exposed_port(trino.port)` return different values whenever
Docker doesn't happen to map the container port 1:1 to the host, which
is the common case.

### Where this was found

Building a nightly CI job in `apache/superset` that tests its Trino
`db_engine_specs` module against a real Trino instance via this library
— more context in the linked issue.

# PR Checklist

- [x] PR title follows Conventional Commits (`fix(trino):`), scoped to
the community module per the community-modules note in the PR template.
- [x] Maintainer edits are allowed on this branch.
- [x] Change is in `src/testcontainers/community/trino/` with a
corresponding test in `tests/community/trino/`.
- [x] No new dependencies added.
- [x] Branch is up to date with `main`.

Author: rusackas

src/testcontainers/community/trino/__init__.py

@@ -38,7 +38,7 @@ def __init__(
         )
 
     def get_connection_url(self):
-        return f"trino://{self.user}@{self.get_container_host_ip()}:{self.port}"
+        return f"trino://{self.user}@{self.get_container_host_ip()}:{self.get_exposed_port(self.port)}"
 
     def _configure(self):
         pass

tests/community/trino/test_trino.py

@@ -1,3 +1,4 @@
+import sqlalchemy
 from trino.dbapi import connect
 
 from testcontainers.community.trino import TrinoContainer
@@ -16,3 +17,12 @@ def test_docker_run_trino():
         rows = cur.fetchall()
         assert rows[0][0] == "451"
         conn.close()
+
+
+def test_get_connection_url():
+    container = TrinoContainer("trinodb/trino:451")
+    with container as trino:
+        engine = sqlalchemy.create_engine(trino.get_connection_url())
+        with engine.connect() as connection:
+            result = connection.execute(sqlalchemy.text("SELECT version()"))
+            assert result.fetchone()[0] == "451"