Merge presubmit and build_binaries scripts

This allows Kokoro to do all the steps at once

justfile

@@ -25,3 +25,9 @@ oak_restricted_kernel_simple_io_bin:
 
 stage0_bin:
     env --chdir=stage0_bin cargo objcopy --release -- --output-target=binary target/x86_64-unknown-none/release/stage0_bin
+
+# Top level target to build all enclave apps and the kernel, and run tests.
+#
+# This is the entry point for Kokoro CI.
+kokoro: all_enclave_apps oak_restricted_kernel_bin stage0_bin
+    cargo nextest run --all-targets --hide-progress-bar

kokoro/presubmit.sh

@@ -11,10 +11,17 @@ export RUST_BACKTRACE=1
 export RUST_LOG=debug
 export XDG_RUNTIME_DIR=/var/run
 
+ls -alsR "$KOKORO_ARTIFACTS_DIR"
+
 ./scripts/docker_pull
 # --all-targets is needed to also run tests for examples and benches.
-./scripts/docker_run nix develop .#ci --command cargo nextest run --all-targets --hide-progress-bar
+./scripts/docker_run nix develop .#ci --command just oak_restricted_kernel_bin
 
 mkdir "$KOKORO_ARTIFACTS_DIR/test_logs/"
 cp ./target/nextest/default/*.xml "$KOKORO_ARTIFACTS_DIR/test_logs/"
-ls -als "$KOKORO_ARTIFACTS_DIR"
+
+# Copy the generated binaries to Placer.
+mkdir -p "$KOKORO_ARTIFACTS_DIR/binaries/oak_restricted_kernel_bin"
+cp ./oak_restricted_kernel_bin/target/x86_64-unknown-none/release/oak_restricted_kernel_bin "$KOKORO_ARTIFACTS_DIR/binaries/oak_restricted_kernel_bin/${KOKORO_GIT_COMMIT_oak:?}"
+
+ls -alsR "$KOKORO_ARTIFACTS_DIR"