chore: improved verify instructions

* No need for root user
* Added how to use the remote key
* Added how to use a local key (missing volume mount)

Author: e-minguez

tasks/ai-library-apps-verifying.adoc

@@ -32,7 +32,7 @@ Run the following command to verify artifacts hosted on the {sappco}.
 
 [source,bash,subs="+attributes"]
 ----
-{prompt_root}docker run --rm dp.apps.rancher.io/containers/cosign:2 \
+{prompt_user}docker run --rm dp.apps.rancher.io/containers/cosign:2 \
   verify dp.apps.rancher.io/containers/milvus:2.6.9 \
   --registry-username <SUSE_APPLICATION_COLLECTION_USERNAME> \ <.>
   --registry-password <SUSE_APPLICATION_COLLECTION_PASSWORD> \ <.>
@@ -50,23 +50,41 @@ Refer to link:https://documentation.suse.com/container/all/single-html/Container
 You can either download the link:/suse-ai/files/sr-pubkey.pem[public key] file or create it by saving the key's content as a text file:
 [source]
 ----
+{prompt_user}cat <<EOF >./suse-ai-pubkey.pem
 -----BEGIN PUBLIC KEY-----
 MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEyeQH2ZWIPhRP+gvznCze1XjosF+M
 RcYK1NYqHrJdicDHaVuY8wRvOWOb3dk87rD4XTRa1PA4OHIukef1lshEfQ==
 -----END PUBLIC KEY-----
+EOF
 ----
 
 Run the following command to verify artifacts hosted on the {sregistry}.
 
 [source,bash,subs="+attributes"]
 ----
-{prompt_root}docker run --rm dp.apps.rancher.io/containers/cosign:2 \
+{prompt_user}docker run --rm \
+  dp.apps.rancher.io/containers/cosign:2 \
   verify registry.suse.com/ai/containers/qdrant:v1.16.3 \
   --registry-username SUSE_REGISTRY_USERNAME \ <.>
   --registry-password SUSE_REGISTRY_PASSWORD \ <.>
-  --key <PUBLIC_KEY_FILE> <.>
+  --key https://documentation.suse.com/suse-ai/files/sr-pubkey.pem
 ----
 <.> Provide {sregistry} user name.
 <.> Provide {sregistry} password.
-<.> Provide a path to the public key file.
-====
+====
+
+Or by mounting the previously created pem file:
+
+[source,bash,subs="+attributes"]
+----
+{prompt_user}docker run --rm \
+  -v $(pwd)/suse-ai-pubkey.pem:/suse-ai-pubkey.pem \
+  dp.apps.rancher.io/containers/cosign:2 \
+  verify registry.suse.com/ai/containers/qdrant:v1.16.3 \
+  --registry-username SUSE_REGISTRY_USERNAME \ <.>
+  --registry-password SUSE_REGISTRY_PASSWORD \ <.>
+  --key /suse-ai-pubkey.pem <.>
+----
+<.> Provide {sregistry} user name.
+<.> Provide {sregistry} password.
+====