basic test added curl timelimit and env test

tests/01-smoke/01-basic-flow.robot

@@ -84,7 +84,7 @@ Verify bind mount in l1 node
 
 Verify port forwarding for node l2
     ${rc}    ${output} =    Run And Return Rc And Output
-    ...    curl localhost:56180
+    ...    curl -m 3 localhost:56180
     Log    ${output}
     Should Be Equal As Integers    ${rc}    0
     Should Contain    ${output}    Thank you for using nginx
@@ -100,6 +100,13 @@ Verify static mgmt addressing for l2
     Log    ${ipv6}
     Should Be Equal As Strings    ${ipv6}    ${n2-ipv6}
 
+Verify on l1 environment variable MYVAR is set 
+    ${rc}    ${output} =    Run And Return Rc And Output
+    ...    ${runtime-cli-exec-cmd} clab-2-linux-nodes-l1 sh -c "echo \\$MYVAR"
+    Log    ${output}
+    Should Be Equal As Integers    ${rc}    0
+    Should Contain    ${output}    MYVAR is SET
+
 Destroy ${lab-name} lab
     ${rc}    ${output} =    Run And Return Rc And Output
     ...    sudo containerlab --runtime ${runtime} destroy -t ${CURDIR}/01-linux-nodes.clab.yml --cleanup

tests/01-smoke/01-linux-nodes.clab.yml

@@ -9,9 +9,11 @@ topology:
     l1:
       kind: linux
       image: alpine:3
-      cmd: ash -c "sleep 9999"
+      cmd: ash -c "echo $MYVAR > /tmp/var && sleep 9999"
       binds:
         - /tmp/clab-01-test.txt:/01-test.txt
+      env:
+        MYVAR: MYVAR is SET
     l2:
       kind: linux
       image: nginx:stable-alpine