quadlet: included test case for fixed bug in the E2E tests

Fixes: #26247

Signed-off-by: Volodymyr Pankin <[email protected]>

Author: NotSoFancyName

test/e2e/quadlet/env.container

@@ -4,9 +4,10 @@
 ## assert-podman-args --env "FOO3=foo3"
 ## assert-podman-args --env "REPLACE=replaced"
 ## assert-podman-args --env "FOO4=foo\\nfoo"
+## assert-podman-args --env "FOO5"
 
 [Container]
 Image=localhost/imagename
 Environment=FOO1=foo1 "FOO2=foo2 " \
                      FOO3=foo3 REPLACE=replace
-Environment=REPLACE=replaced 'FOO4=foo\nfoo'
+Environment=REPLACE=replaced 'FOO4=foo\nfoo' FOO5