Minor fix in SMTP script

Use docker compose exec in conjunction with curl. By executing curl within the Docker container, SSL certificate validation is correctly performed. Previously the curl command was executed in the host and the request was hardcoded to use localhost as the hostname. While this process works correctly in the development environment, it fails to match any common or subject alternative name included in the certificate on the production instance.

scripts/add-smtp-credentials.sh

@@ -33,7 +33,11 @@ username=$(grep -E "^OPENSEARCH_ADMIN_USERNAME=" .env | cut -d '=' -f 2- || echo
 password=$(grep -E "^OPENSEARCH_ADMIN_PASSWORD=" .env | cut -d '=' -f 2- || echo "admin")
 
 # reload settings for changes to take effect
-response=$(curl -s -u "${username}:${password}" -w "\n%{http_code}" -X POST https://localhost:9200/_nodes/reload_secure_settings --cacert ./ssl/root-ca-crt.pem)
+response=$(docker compose exec os-node-1 curl -s \
+    -u "${username}:${password}" \
+    -w "\n%{http_code}" \
+    -X POST https://localhost:9200/_nodes/reload_secure_settings \
+    --cacert /usr/share/opensearch/config/root-ca.pem)
 
 # separate response message and HTTP status code
 response_message=$(echo "$response" | sed '$d')