ci: avoid rsync dependency in NetBSD VM jobs

.github/workflows/vm.yml

@@ -166,7 +166,12 @@ jobs:
       with:
         release: ${{ matrix.target }}
         usesh: true
+        sync: scp
+        copyback: false
         prepare: |
+          case "$(uname -r)" in
+          9.*) export PKG_PATH="ftp://ftp.NetBSD.org/pub/pkgsrc/packages/NetBSD/$(uname -p)/9.0_2026Q1/All" ;;
+          esac
           /usr/sbin/pkg_add sudo
           openssl rand -base64 9 >$GITHUB_WORKSPACE/regress/password
           pw=$(tr -d '\n' <$GITHUB_WORKSPACE/regress/password | pwhash)
@@ -496,4 +501,3 @@ jobs:
         cd $GITHUB_WORKSPACE
         cp regress/password regress/kbdintpw
         sudo -u builder env SUDO=sudo TEST_SSH_SSHD_CONFOPTS="UsePam yes" make t-exec
-