Test environment initial setup

Downloads, installs and starts up Nigiri in the local host.
Assumes that Docker is installed.

Nigiri starts up Docker containers for bitcoind, electrs and esplora in regtest.
The integration tests should be able to connect to them.

adaptor/tests/bisq_musig_integration_test.rs

@@ -0,0 +1,7 @@
+mod common;
+
+#[test]
+fn test_bisq_musig() {
+    common::setup();
+    assert_eq!(2 + 2, 4);
+}

adaptor/tests/common/mod.rs

@@ -0,0 +1,55 @@
+pub fn setup() {
+    use std::process::Command;
+
+    println!("Starting the setup...");
+
+    // Step 1: Run the curl command to download and install Nigiri
+    let curl_output = Command::new("sh")
+        .arg("-c")
+        .arg("curl https://getnigiri.vulpem.com | bash")
+        .output();
+
+    match curl_output {
+        Ok(output) => {
+            if output.status.success() {
+                println!("Successfully ran the curl command.");
+            } else {
+                eprintln!(
+                    "Failed to run the curl command. Error: {}",
+                    String::from_utf8_lossy(&output.stderr)
+                );
+                std::process::exit(1);
+            }
+        }
+        Err(e) => {
+            eprintln!("Error while running the curl command: {}", e);
+            std::process::exit(1);
+        }
+    }
+
+    // Step 2: Run 'nigiri start' to start Nigiri
+    let nigiri_output = Command::new("nigiri")
+        .arg("start")
+        .output();
+
+    match nigiri_output {
+        Ok(output) => {
+            if output.status.success() {
+                println!("Nigiri started successfully.");
+            } else {
+                eprintln!(
+                    "Failed to start Nigiri. Error: {}",
+                    String::from_utf8_lossy(&output.stderr)
+                );
+                std::process::exit(1);
+            }
+        }
+        Err(e) => {
+            eprintln!("Error while starting Nigiri: {}", e);
+            std::process::exit(1);
+        }
+    }
+
+    println!("Setup completed successfully.");
+}
+