Add private_memory_server to kokoro build.

ACKNOWLEDGE_FAILING_COPYBARA_IMPORT=The failure is not caused my this
change. cl/726948285 can be used for fixing tests while importing.

BUG: 396479186
Change-Id: I1a61b559822d5fc467de26939a73dca445580ff9

justfile

@@ -177,6 +177,13 @@ oak_client_android_app:
         bazel-bin/java/src/main/java/com/google/oak/client/android/client_app.apk \
         artifacts
 
+oak_private_memory:
+    bazel build {{BAZEL_CONFIG_FLAG}} \
+        //oak_private_memory:private_memory_server
+    cp --force --preserve=timestamps --no-preserve=mode \
+        bazel-bin/oak_private_memory/private_memory_server \
+        artifacts
+
 wasm_crate name:
     cargo build --target=wasm32-unknown-unknown -p {{name}}
 
@@ -294,7 +301,7 @@ check-format:
 
 kokoro_build_binaries_rust: build_all_enclave_apps oak_restricted_kernel_bin_virtio_console_channel \
     oak_restricted_kernel_wrapper_simple_io_channel stage0_bin stage0_bin_tdx \
-    oak_client_android_app
+    oak_client_android_app oak_private_memory
 
 kokoro_verify_buildconfigs:
     ./scripts/test_buildconfigs buildconfigs/*.sh

kokoro/helpers/copy_binaries.sh

@@ -31,6 +31,7 @@ function copy_binaries_to_placer() {
         artifacts/oak_restricted_kernel_wrapper_simple_io_channel_bin
         artifacts/stage0_bin
         artifacts/stage0_bin_tdx
+        artifacts/private_memory_server
     )
     readonly binary_names=(
         oak_containers_agent
@@ -53,6 +54,7 @@ function copy_binaries_to_placer() {
         oak_restricted_kernel_simple_io_init_rd_wrapper_bin
         stage0_bin
         stage0_bin_tdx
+        private_memory_server
     )
     for i in "${!binary_names[@]}"; do
         cp --preserve=timestamps \