Refactoring to use Docker sockets directly as well as fork() to call processes instead of opening shells

src/docker_engine_client.hpp

@@ -0,0 +1,23 @@
+#pragma once
+
+#include <string>
+
+struct EngineResponse {
+    int status_code = 0;
+    std::string body;
+    std::string error;
+
+    bool ok() const { return status_code >= 200 && status_code < 300 && error.empty(); }
+};
+
+class DockerEngineClient {
+public:
+    explicit DockerEngineClient(std::string socket_path = "/var/run/docker.sock");
+
+    EngineResponse request(const std::string& method,
+                           const std::string& path,
+                           const std::string& body = {}) const;
+
+private:
+    std::string socket_path_;
+};