gitlab-ci: delete extraneous keystore key from PUBLISH job

repo_keyalias is set in tests/config.yml, so this does not need to fake the
fdroiddata value.

.gitlab-ci.yml

@@ -760,9 +760,6 @@ PUBLISH:
     # silence warnings
     - chmod 0600 config.yml config/*.yml config/*/*.yml
     - chmod 0700 $gpghome
-    # make fake 'ciarang' index signing key
-    - keytool -keyclone -alias 4e7da5b7 -dest ciarang
-        -keypass:env keypass -new:env keypass -storepass:env keystorepass -keystore $keystore
 
     - export PATH=$CI_PROJECT_DIR:$PATH