add tetragon policies

Signed-off-by: gwg313 <gwg313@pm.me>

platform/tetragon/policies/tracingpolicy-shell-spawn.yaml

@@ -0,0 +1,24 @@
+apiVersion: cilium.io/v1alpha1
+kind: TracingPolicy
+metadata:
+  name: detect-shell-spawn
+spec:
+  kprobes:
+    - call: "security_bprm_check"
+      syscall: false
+
+      selectors:
+        - matchBinaries:
+            - operator: In
+              values:
+                - /bin/sh
+                - /bin/bash
+                - /bin/dash
+                - /bin/ash
+                - /busybox/sh
+
+      args:
+        - index: 0
+          type: string
+
+      return: true