github/test: Run tests with address sanitizer

We have lots of cgo interaction here so better to check things fully.

This also requires manually checking for leaks, so add support for this.

.gitignore

@@ -1,4 +1,4 @@
-coverage.out
+coverage*.out
 example-module/*.so
 example-module/*.h
 cmd/pam-moduler/tests/*/*.so