Switch to the unauthenticated CDN for BCI repo

Using the authenticated CDN was kinda only an error and is there
for historic reasons.

src/bci_build/package/base.py

@@ -55,9 +55,9 @@ def _get_base_config_sh_script(os_version: OsVersion) -> str:
 #======================================
 # Configure SLE BCI repositories
 #--------------------------------------
-zypper -n ar --refresh --gpgcheck --priority 100 --enable 'https://updates.suse.com/SUSE/Products/SLE-BCI/$releasever_major-SP$releasever_minor/$basearch/product/' SLE_BCI
-zypper -n ar --refresh --gpgcheck --priority 100 --disable 'https://updates.suse.com/SUSE/Products/SLE-BCI/$releasever_major-SP$releasever_minor/$basearch/product_debug/' SLE_BCI_debug
-zypper -n ar --refresh --gpgcheck --priority 100 --disable 'https://updates.suse.com/SUSE/Products/SLE-BCI/$releasever_major-SP$releasever_minor/$basearch/product_source/' SLE_BCI_source
+zypper -n ar --refresh --gpgcheck --priority 100 --enable 'https://installer-updates.suse.com/SUSE/Products/SLE-BCI/$releasever_major-SP$releasever_minor/$basearch/product/' SLE_BCI
+zypper -n ar --refresh --gpgcheck --priority 100 --disable 'https://installer-updates.suse.com/SUSE/Products/SLE-BCI/$releasever_major-SP$releasever_minor/$basearch/product_debug/' SLE_BCI_debug
+zypper -n ar --refresh --gpgcheck --priority 100 --disable 'https://installer-updates.suse.com/SUSE/Products/SLE-BCI/$releasever_major-SP$releasever_minor/$basearch/product_source/' SLE_BCI_source
 {%- endif %}
 
 #======================================