diff --git a/INTERNAL.md b/INTERNAL.md
index 34484836..b3335fed 100644
--- a/INTERNAL.md
+++ b/INTERNAL.md
@@ -16,3 +16,7 @@
 The `ci.yml` workflow includes support for [act](https://github.com/nektos/act).
 
 To run all tests using act, run `composer act`. To run only certain tests using act, use `composer act-input "FILTER='some test name'"` or `composer act -- --input "FILTER='some test name'"`.
+
+Helpful note: GHA doesn't mount the project at /var/www/html like the docker compose setup does. This can be observed in act where the inner container's filesystem structure will match the host.
+
+Also, for debugging act you can just add a job that does `sleep 1h` and then `docker ps` + `docker exec -it <id> bash`.
diff --git a/tests/Features/NoAttachTest.php b/tests/Features/NoAttachTest.php
index 90477103..9ba6079d 100644
--- a/tests/Features/NoAttachTest.php
+++ b/tests/Features/NoAttachTest.php
@@ -27,9 +27,11 @@
     }
 
     if (php_uname('m') == 'aarch64') {
-        DisallowSqliteAttach::$extensionPath = '/var/www/html/extensions/lib/arm/noattach.so';
+        // Escape testbench prison. Can't hardcode /var/www/html/extensions/... here
+        // since GHA doesn't mount the filesystem on the container's workdir
+        DisallowSqliteAttach::$extensionPath = realpath(base_path('../../../../extensions/lib/arm/noattach.so'));
     } else {
-        DisallowSqliteAttach::$extensionPath = '/var/www/html/extensions/lib/noattach.so';
+        DisallowSqliteAttach::$extensionPath = realpath(base_path('../../../../extensions/lib/noattach.so'));
     }
 
     if ($disallow) config(['tenancy.features' => [DisallowSqliteAttach::class]]);