Update examples/sftp: Dependencies, container, host key

Update all dependencies to latest versions.

Update container from single arch atmoz/sftp:alpine-3.7 to
multi arch jmcombs/sftp:alpine, see https://github.com/jmcombs/sftp

Replace insecure `"StrictHostKeyChecking", "no"` with a sample host key
to demonstrate that the test should also cover the host key checking.

Author: julianladisch

examples/sftp/build.gradle

@@ -7,11 +7,12 @@ repositories {
 }
 
 dependencies {
-    testImplementation 'com.jcraft:jsch:0.1.55'
+    testImplementation 'com.github.mwiede:jsch:0.2.24'
     testImplementation 'org.testcontainers:testcontainers'
-    testImplementation 'org.assertj:assertj-core:3.26.3'
-    testImplementation 'ch.qos.logback:logback-classic:1.3.14'
-    testImplementation 'org.junit.jupiter:junit-jupiter:5.11.0'
+    testImplementation 'org.assertj:assertj-core:3.27.3'
+    testImplementation 'ch.qos.logback:logback-classic:1.5.17'
+    testImplementation 'org.junit.jupiter:junit-jupiter:5.12.1'
+    testRuntimeOnly 'org.junit.platform:junit-platform-launcher'
 }
 
 test {

examples/sftp/src/test/java/org/example/SftpContainerTest.java

@@ -1,15 +1,19 @@
 package org.example;
 
 import com.jcraft.jsch.ChannelSftp;
+import com.jcraft.jsch.HostKey;
 import com.jcraft.jsch.JSch;
 import com.jcraft.jsch.Session;
+import com.jcraft.jsch.UserInfo;
+
 import org.junit.jupiter.api.Test;
 import org.testcontainers.containers.GenericContainer;
 import org.testcontainers.utility.MountableFile;
 
 import java.io.BufferedReader;
 import java.io.InputStreamReader;
 import java.nio.charset.StandardCharsets;
+import java.util.Base64;
 import java.util.stream.Collectors;
 
 import static org.assertj.core.api.Assertions.assertThat;
@@ -19,19 +23,26 @@ class SftpContainerTest {
     @Test
     void test() throws Exception {
         try (
-            GenericContainer<?> sftp = new GenericContainer<>("atmoz/sftp:alpine-3.7")
+            GenericContainer<?> sftp = new GenericContainer<>("jmcombs/sftp:alpine")
                 .withCopyFileToContainer(
                     MountableFile.forClasspathResource("testcontainers/", 0777),
                     "/home/foo/upload/testcontainers"
                 )
+                .withCopyFileToContainer(
+                    MountableFile.forClasspathResource("./ssh_host_ed25519_key", 0400),
+                    "/etc/ssh/ssh_host_ed25519_key"
+                )
                 .withExposedPorts(22)
                 .withCommand("foo:pass:::upload")
         ) {
             sftp.start();
             JSch jsch = new JSch();
             Session jschSession = jsch.getSession("foo", sftp.getHost(), sftp.getMappedPort(22));
             jschSession.setPassword("pass");
-            jschSession.setConfig("StrictHostKeyChecking", "no");
+            // hostKeyString is string starting with AAAA from file known_hosts or ssh_host_*_key.pub
+            String hostKeyString = "AAAAC3NzaC1lZDI1NTE5AAAAINaBuegbLGHOgpXCePq80uY79Xw716jWXAwWjRdFYi53";
+            HostKey hostKey = new HostKey(sftp.getHost(), Base64.getDecoder().decode(hostKeyString));
+            jschSession.getHostKeyRepository().add(hostKey, null);
             jschSession.connect();
             ChannelSftp channel = (ChannelSftp) jschSession.openChannel("sftp");
             channel.connect();

examples/sftp/src/test/resources/ssh_host_ed25519_key

@@ -0,0 +1,7 @@
+-----BEGIN OPENSSH PRIVATE KEY-----
+b3BlbnNzaC1rZXktdjEAAAAABG5vbmUAAAAEbm9uZQAAAAAAAAABAAAAMwAAAAtzc2gtZW
+QyNTUxOQAAACDWgbnoGyxhzoKVwnj6vNLmO/V8O9eo1lwMFo0XRWIudwAAAJixm9bFsZvW
+xQAAAAtzc2gtZWQyNTUxOQAAACDWgbnoGyxhzoKVwnj6vNLmO/V8O9eo1lwMFo0XRWIudw
+AAAEDUMj/yjokN6yVDNM85skqB2LrPXgyH4FyztT3r3uKBDNaBuegbLGHOgpXCePq80uY7
+9Xw716jWXAwWjRdFYi53AAAAD2FhQDIzLTA3MTUzLTAwOQECAwQFBg==
+-----END OPENSSH PRIVATE KEY-----

examples/sftp/src/test/resources/ssh_host_ed25519_key.pub

@@ -0,0 +1 @@
+ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAINaBuegbLGHOgpXCePq80uY79Xw716jWXAwWjRdFYi53 someone@localhost