Merge pull request #546 from dtantsur/release-26.0

🌱 Update for release-26.0

Author: metal3-io-bot

Dockerfile

@@ -32,7 +32,7 @@ ARG INSTALL_TYPE=source
 
 # build arguments for source build customization
 ARG UPPER_CONSTRAINTS_FILE
-ARG IRONIC_SOURCE
+ARG IRONIC_SOURCE=bugfix/26.0
 ARG IRONIC_LIB_SOURCE
 ARG SUSHY_SOURCE