**What happened:**

My password for external Postgres RDS contained '@123' at the end which got appended to the host of the DB due to some bug. One can notice in the logs, the DB_HOST has an unwanted 123@ in the front of it  DB_HOST=**123@**{{postgres_host}}. I removed '@' character from the password and it worked fine. 

I am using the latest image of apache/airflow and using the official helm chart.

```
kc logs airflow-run-airflow-migrations-xxx
BACKEND=postgresql
DB_HOST=123@{{postgres_host}}
DB_PORT=5432
....................
ERROR! Maximum number of retries (20) reached.

Last check result:
$ run_nc '123@{{postgres_host}}' '5432'
Traceback (most recent call last):
  File "<string>", line 1, in <module>
socket.gaierror: [Errno -2] Name or service not known
Can't parse  as an IP address
```

**Steps to reproduce:**
One can easily reproduce this by using a password that contains the '@' character in it.
```
data:
  metadataConnection:
    user: {{postgres_airflow_username}}
    pass: {{postgres_airflow_password}}
    protocol: postgresql  
    host: {{postgres_host}}
    port: 5432
    db: {{postgres_airflow_dbname}}
```

**Expected behavior:**
Migrations should run irrespective if the Postgres password contains an @ character or not.
chart/tests/test_redis.py
docs = render_chart(
            values={
                "redis": {
                    "resources": {
                        "limits": {"cpu": "200m", 'memory': "128Mi"},
                        "requests": {"cpu": "300m", 'memory': "169Mi"},
                    }
                },
            },
            show_only=["templates/redis/redis-statefulset.yaml"],
        )
        assert "128Mi" == jmespath.search("spec.template.spec.containers[0].resources.limits.memory", docs[0])
        assert "169Mi" == jmespath.search(
            "spec.template.spec.containers[0].resources.requests.memory", docs[0]
        )
        assert "300m" == jmespath.search("spec.template.spec.containers[0].resources.requests.cpu", docs[0])
    def test_redis_resources_are_not_added_by_default(self):
        docs = render_chart(
            show_only=["templates/redis/redis-statefulset.yaml"],
        )
        assert jmespath.search("spec.template.spec.containers[0].resources", docs[0]) == {}