Create the uploaded file from inside RobotFramework

according to
https://github.com/mozilla/geckodriver/releases/tag/v0.34.0 and
https://firefox-source-docs.mozilla.org/testing/geckodriver/Usage.html#running-firefox-in-a-container-based-package

> When Firefox is packaged inside a container (e.g. Snap, Flatpak),
> it may see a different filesystem to the host....

> This is known to affect launching the default Firefox shipped with Ubuntu 22.04+

while Firefox doesn't seem to hang this may be what's causing the
failure to find an existing file for upload. If FF thinks that that
filesystem is different then that could be it! Therefore generate a
temporary file and use it during testing.

tests/test_http.sh

@@ -130,7 +130,7 @@ _EOF_
             rlRun -t -c "robot tests/ui/test_upload_file.robot"
 
             # verify file is there
-            rlRun -t -c "curl -k -D- --silent $HTTPS/uploads/attachments/testplans_testplan/1/test_upload_file.robot | grep '200 OK'"
+            rlRun -t -c "curl -k -D- --silent $HTTPS/uploads/attachments/testplans_testplan/1/hello-robots.txt | grep '200 OK'"
         fi
     rlPhaseEnd
 

tests/ui/test_upload_file.robot

@@ -1,4 +1,5 @@
 *** Settings ***
+Library           OperatingSystem
 Library           SeleniumLibrary
 
 *** Variables ***
@@ -25,7 +26,8 @@ Uploading file works via file upload
     Title Should Be       Kiwi TCMS - Dashboard
 
     Go To                 ${TEST_PLAN_URL}
-    Choose File   id:id_attachment_file    ${CURDIR}${/}test_upload_file.robot
+    Create File   ${TEMPDIR}${/}hello-robots.txt   Hello Robots
+    Choose File   id:id_attachment_file    ${TEMPDIR}${/}hello-robots.txt
     Click Button  Add attachment
     Page Should Contain   Your attachment was uploaded