integration-tests: run in release also

In release, the trigger functions were being optimized out and the
tests did not work. Use core::hint::black_box to ensure that the
functions are not optimized out. Also, run these integration tests
in CI to ensure that we don't regress.

test/integration-test/src/tests/bpf_probe_read.rs

@@ -116,8 +116,12 @@ fn load_and_attach_uprobe(prog_name: &str, func_name: &str, bytes: &[u8]) -> Bpf
 
 #[no_mangle]
 #[inline(never)]
-pub extern "C" fn trigger_bpf_probe_read_user(_string: *const u8, _len: usize) {}
+pub extern "C" fn trigger_bpf_probe_read_user(string: *const u8, len: usize) {
+    core::hint::black_box((string, len));
+}
 
 #[no_mangle]
 #[inline(never)]
-pub extern "C" fn trigger_bpf_probe_read_kernel(_len: usize) {}
+pub extern "C" fn trigger_bpf_probe_read_kernel(len: usize) {
+    core::hint::black_box(len);
+}

test/integration-test/src/tests/log.rs

@@ -9,7 +9,9 @@ use log::{Level, Log, Record};
 
 #[no_mangle]
 #[inline(never)]
-pub extern "C" fn trigger_ebpf_program() {}
+pub extern "C" fn trigger_ebpf_program() {
+    core::hint::black_box(trigger_ebpf_program);
+}
 
 struct TestingLogger<F> {
     log: F,

test/integration-test/src/tests/relocations.rs

@@ -49,4 +49,6 @@ fn load_and_attach(name: &str, bytes: &[u8]) -> Bpf {
 
 #[no_mangle]
 #[inline(never)]
-pub extern "C" fn trigger_relocations_program() {}
+pub extern "C" fn trigger_relocations_program() {
+    core::hint::black_box(trigger_relocations_program);
+}

test/run.sh

@@ -244,6 +244,9 @@ rsync_vm "--exclude=target --exclude=.tmp $AYA_SOURCE_DIR"
 
 exec_vm "cd aya; cargo xtask integration-test"
 
+# run the integration tests again in release, they should still work.
+exec_vm "cd aya; cargo xtask integration-test --cargo-arg=--release"
+
 # we rm and sync but it doesn't seem to work reliably - I guess we could sleep a
 # few seconds after but ain't nobody got time for that. Instead we also rm
 # before rsyncing.