added tools cert command

tests/01-smoke/06-tools-certs.robot

@@ -0,0 +1,33 @@
+*** Comments ***
+This test suite verifies that `tools cert` commands are working fine
+
+*** Settings ***
+Library           OperatingSystem
+Library           String
+# ensure we remove any certs from prev runs
+Suite Setup       Cleanup
+Suite Teardown    Cleanup
+
+*** Variables ***
+${root-ca-dir}    /tmp/clab-tests/certs/06-ca
+${node-cert-dir}    /tmp/clab-tests/certs/06-node-cert
+
+*** Test Cases ***
+Create CA certificate
+    ${rc}    ${output} =    Run And Return Rc And Output
+    ...    sudo containerlab tools cert ca create --path ${root-ca-dir} --name root-ca --expiry 1m
+    Log    ${output}
+    Should Be Equal As Integers    ${rc}    0
+    Should Contain    ${output}    Certificate attributes: CN=containerlab.srlinux.dev, C=Internet, L=Server, O=Containerlab, OU=Containerlab Tools, Validity period=1m
+
+Create and sign end node certificates
+    ${rc}    ${output} =    Run And Return Rc And Output
+    ...    sudo containerlab tools cert sign --ca-cert ${root-ca-dir}/root-ca.pem --ca-key ${root-ca-dir}/root-ca-key.pem --hosts node.io,192.168.0.1 --path ${node-cert-dir}
+    Log    ${output}
+    Should Be Equal As Integers    ${rc}    0
+    Should Contain    ${output}    Creating and signing certificate: Hosts=[\\"node.io\\" \\"192.168.0.1\\"], CN=containerlab.srlinux.dev, C=Internet, L=Server, O=Containerlab, OU=Containerlab Tools
+
+*** Keywords ***
+Cleanup
+    Run    rm -rf ${root-ca-dir}
+    Run    rm -rf ${node-cert-dir}