fix: add SSH key fixtures and improve E2E test SSH connectivity

- Add testing SSH key pair in fixtures/ directory for CI/CD compatibility
- Update cloud-init.yml to use the new testing public key
- Modify e2e_tests.rs to copy SSH keys to temporary directory during tests
- Use temporary SSH keys instead of relying on local ~/.ssh/testing_rsa
- Add tempfile dependency for secure temporary directory management
- Suppress dead_code warning for temp_dir field (needed for directory lifetime)
- Add verbose logging for SSH key and temp directory paths

This resolves the SSH connectivity issue in GitHub Actions by providing
self-contained SSH keys that don't depend on local machine configuration.

Author: josecelano

Cargo.toml

@@ -19,3 +19,4 @@ anyhow = "1.0"
 clap = { version = "4.0", features = ["derive"] }
 regex = "1.0"
 dirs = "5.0"
+tempfile = "3.0"

config/tofu/lxd/cloud-init.yml

@@ -16,7 +16,7 @@ users:
     shell: /bin/bash
     sudo: ["ALL=(ALL) NOPASSWD:ALL"]
     ssh_authorized_keys:
-      - ssh-rsa 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 testing-key-for-torrust-deploy
+      - ssh-rsa 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 testing@torrust-testing-infra
 
 runcmd:
   - echo "VM provisioned successfully" > /tmp/provision_complete

src/bin/e2e_tests.rs

@@ -5,6 +5,7 @@ use serde_json::Value;
 use std::path::{Path, PathBuf};
 use std::process::{Command, Stdio};
 use std::time::{Duration, Instant};
+use tempfile::TempDir;
 use tokio::time::sleep;
 
 #[derive(Parser)]
@@ -33,17 +34,46 @@ struct TestEnvironment {
     project_root: PathBuf,
     keep_env: bool,
     verbose: bool,
+    ssh_key_path: PathBuf,
+    #[allow(dead_code)] // Kept to maintain temp directory lifetime
+    temp_dir: Option<tempfile::TempDir>,
 }
 
 impl TestEnvironment {
     fn new(keep_env: bool, verbose: bool) -> Result<Self> {
         // Get project root (current directory when running from root)
         let project_root = std::env::current_dir()?;
 
+        // Create temporary directory for SSH keys
+        let temp_dir = TempDir::new().context("Failed to create temporary directory")?;
+        
+        // Copy SSH private key from fixtures to temp directory
+        let fixtures_ssh_key = project_root.join("fixtures/testing_rsa");
+        let temp_ssh_key = temp_dir.path().join("testing_rsa");
+        
+        std::fs::copy(&fixtures_ssh_key, &temp_ssh_key)
+            .context("Failed to copy SSH private key to temporary directory")?;
+        
+        // Set proper permissions on the SSH key (600)
+        #[cfg(unix)]
+        {
+            use std::os::unix::fs::PermissionsExt;
+            let mut perms = std::fs::metadata(&temp_ssh_key)?.permissions();
+            perms.set_mode(0o600);
+            std::fs::set_permissions(&temp_ssh_key, perms)?;
+        }
+        
+        if verbose {
+            println!("🔑 SSH key copied to temporary location: {}", temp_ssh_key.display());
+            println!("📁 Temporary directory: {}", temp_dir.path().display());
+        }
+        
         Ok(Self {
             project_root,
             keep_env,
             verbose,
+            ssh_key_path: temp_ssh_key,
+            temp_dir: Some(temp_dir),
         })
     }
 
@@ -140,17 +170,13 @@ impl TestEnvironment {
     async fn wait_for_ssh_connectivity(&self, ip: &str) -> Result<()> {
         println!("🔌 Waiting for SSH connectivity...");
 
-        let ssh_key = dirs::home_dir()
-            .ok_or_else(|| anyhow!("Could not determine home directory"))?
-            .join(".ssh/testing_rsa");
-        
         let max_attempts = 30;
         let mut attempt = 0;
 
         while attempt < max_attempts {
             let result = Command::new("ssh")
                 .args(&[
-                    "-i", ssh_key.to_str().unwrap(),
+                    "-i", self.ssh_key_path.to_str().unwrap(),
                     "-o", "StrictHostKeyChecking=no",
                     "-o", "UserKnownHostsFile=/dev/null",
                     "-o", "ConnectTimeout=5",
@@ -223,14 +249,10 @@ impl TestEnvironment {
     async fn validate_cloud_init_completion(&self, container_ip: &str) -> Result<()> {
         println!("🔍 Validating cloud-init completion...");
 
-        let ssh_key = dirs::home_dir()
-            .ok_or_else(|| anyhow!("Could not determine home directory"))?
-            .join(".ssh/testing_rsa");
-        
         // Check cloud-init status
         let output = Command::new("ssh")
             .args(&[
-                "-i", ssh_key.to_str().unwrap(),
+                "-i", self.ssh_key_path.to_str().unwrap(),
                 "-o", "StrictHostKeyChecking=no",
                 "-o", "UserKnownHostsFile=/dev/null",
                 &format!("torrust@{}", container_ip),
@@ -251,7 +273,7 @@ impl TestEnvironment {
         // Check for completion marker file
         let marker_check = Command::new("ssh")
             .args(&[
-                "-i", ssh_key.to_str().unwrap(),
+                "-i", self.ssh_key_path.to_str().unwrap(),
                 "-o", "StrictHostKeyChecking=no",
                 "-o", "UserKnownHostsFile=/dev/null",
                 &format!("torrust@{}", container_ip),