feat(installer): build worker source over SSH

cmd/rsmon-worker/main_test.go

@@ -18,6 +18,15 @@ func TestDispatchManagementCommand(t *testing.T) {
 	if handled, code := dispatchManagementCommand([]string{"install", "--help"}); !handled || code != 0 {
 		t.Fatalf("install help = handled %t code %d", handled, code)
 	}
+	if handled, code := dispatchManagementCommand([]string{"deploy", "--help"}); !handled || code != 0 {
+		t.Fatalf("deploy help = handled %t code %d", handled, code)
+	}
+	if handled, code := dispatchManagementCommand([]string{"source-install", "--help"}); !handled || code != 0 {
+		t.Fatalf("source-install help = handled %t code %d", handled, code)
+	}
+	if handled, code := dispatchManagementCommand([]string{"source-install", "--identity-file", t.TempDir() + "/missing"}); !handled || code == 0 {
+		t.Fatalf("source-install without host/user = handled %t code %d", handled, code)
+	}
 }
 
 func TestSecretValue(t *testing.T) {