e2e: Add OCI cosign tests

Signed-off-by: Stefan Prodan <[email protected]>

tests/v2.2/sources/oci.yaml

@@ -0,0 +1,16 @@
+---
+apiVersion: source.toolkit.fluxcd.io/v1beta2
+kind: OCIRepository
+metadata:
+  name: podinfo-cosign
+  namespace: sources
+spec:
+  interval: 10m
+  url: oci://ghcr.io/stefanprodan/manifests/podinfo
+  ref:
+    semver: ">1.0.0"
+  verify:
+    provider: cosign
+    matchOIDCIdentity:
+      - issuer: "^https://token.actions.githubusercontent.com$"
+        subject: "^https://github.com/stefanprodan/podinfo.*$"