Fix Exasol integration test: disable cert validation for Docker

Default ADBC_EXASOL_VALIDATE_CERT=0 since Exasol Docker uses
self-signed certificates. Can be overridden via env var.

Author: marconae

crates/dbt-xdbc/tests/driver/mod.rs

@@ -188,6 +188,16 @@ mod tests {
                     env::var("ADBC_EXASOL_USERNAME").unwrap_or_else(|_| "sys".to_owned());
                 let password =
                     env::var("ADBC_EXASOL_PASSWORD").unwrap_or_else(|_| "exasol".to_owned());
+                let validate_cert = env::var("ADBC_EXASOL_VALIDATE_CERT")
+                    .unwrap_or_else(|_| "0".to_owned());
+                // Append certificate validation param if not already in URI
+                let uri = if uri.contains("validateservercertificate") {
+                    uri
+                } else if uri.contains('?') {
+                    format!("{uri}&validateservercertificate={validate_cert}")
+                } else {
+                    format!("{uri}?validateservercertificate={validate_cert}")
+                };
                 builder
                     .with_parse_uri(uri)?
                     .with_username(username)