feat: add worker install and deploy

internal/installer/deploy_test.go

@@ -0,0 +1,41 @@
+package installer
+
+import (
+	"crypto/ed25519"
+	"crypto/rand"
+	"net"
+	"testing"
+
+	"golang.org/x/crypto/ssh"
+)
+
+func TestFingerprintHostKeyCallback(t *testing.T) {
+	_, privateKey, err := ed25519.GenerateKey(rand.Reader)
+	if err != nil {
+		t.Fatal(err)
+	}
+	publicKey, err := ssh.NewPublicKey(privateKey.Public())
+	if err != nil {
+		t.Fatal(err)
+	}
+	callback, err := hostKeyCallback(DeployOptions{HostKeyFingerprint: ssh.FingerprintSHA256(publicKey)})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if err := callback("host", &net.TCPAddr{}, publicKey); err != nil {
+		t.Fatalf("matching fingerprint rejected: %v", err)
+	}
+	callback, err = hostKeyCallback(DeployOptions{HostKeyFingerprint: "SHA256:wrong"})
+	if err != nil {
+		t.Fatal(err)
+	}
+	if err := callback("host", &net.TCPAddr{}, publicKey); err == nil {
+		t.Fatal("mismatched fingerprint accepted")
+	}
+}
+
+func TestKnownHostsMissingFile(t *testing.T) {
+	if _, err := hostKeyCallback(DeployOptions{KnownHostsFile: t.TempDir() + "/missing"}); err == nil {
+		t.Fatal("missing known_hosts file accepted")
+	}
+}