initial commit

dev/tekton/tasks/cosign/cosign.yaml

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+apiVersion: v1
+kind: Pod
+metadata:
+  name: cosign-debug
+spec:
+  containers:
+    - name: cosign
+      image: bitnami/cosign
+      command: ["sleep", "3600"]
+      volumeMounts:
+        - name: cosign-key
+          mountPath: /cosign
+  volumes:
+    - name: cosign-key
+      secret:
+        secretName: cosign-key-secret
+        items:
+          - key: cosign.key
+            path: key