CI: Do not run tests in the bootstrap task

- It is useless, as `python3 /tmp/bork...pyz run test` immediately shells out
  to pytest, and tests the version of bork that is on the filesystem.
- It fails because `git` isn't installed.

.cirrus.yml

@@ -44,8 +44,8 @@ Zipapp_bootstrap_task:
     - cd /tmp/pass3
     - cp /tmp/pass2/dist/bork-*.pyz /tmp/bork-pass2.pyz
     - python3 /tmp/bork-pass2.pyz build
-    - cp ./dist/bork-*.pyz /tmp/bork-pass3.pyz
-    - python3 /tmp/bork-pass3.pyz run lint
+    - '[ -e ./dist/bork-*.pyz ]'
+
 
 Linux_task:
   container: