Add a cli interface to choose a configuration (#163)

- [x] add a cli to the webserver to take env variables into account 
- [x] add a cli to the data processing that takes enviromental variable
as a valid source into account
- [x] rework the cli for the reset sql command
- [x] rework the cli for the copying of sql data from one db to another

tests/config/config_template_test.py

@@ -0,0 +1,34 @@
+"""Test for config templates."""
+from aki_prj23_transparenzregister.config.config_template import (
+    MongoConnection,
+    SQLiteConnectionString,
+)
+
+
+def test_sqlite_connection_string() -> None:
+    """Tests if the sqlite protocol is correctly added to a path."""
+    assert str(SQLiteConnectionString("some-path-to.db")) == "sqlite:///some-path-to.db"
+    assert (
+        str(SQLiteConnectionString("other-path-to.db")) == "sqlite:///other-path-to.db"
+    )
+    assert SQLiteConnectionString("some-path-to.db") == SQLiteConnectionString(
+        "some-path-to.db"
+    )
+
+
+def test_get_conn_string_no_credentials() -> None:
+    """Tests the mongo connection string generation."""
+    conn = MongoConnection("localhost", "", 27017, None, None)
+    assert conn.get_conn_string() == "mongodb://localhost:27017"
+
+
+def test_get_conn_string_no_port_but_credentials() -> None:
+    """Tests the mongo connection string generation."""
+    conn = MongoConnection("localhost", "", None, "admin", "password")
+    assert conn.get_conn_string() == "mongodb+srv://admin:password@localhost"
+
+
+def test_get_conn_simple() -> None:
+    """Tests the mongo connection string generation."""
+    conn = MongoConnection("localhost", "", None, None, None)
+    assert conn.get_conn_string() == "mongodb+srv://localhost"