fix: work around missing InCommon certificate

containers/jug/dev.Dockerfile

@@ -130,6 +130,8 @@ git -C ${KEY4HEPSPACK_ROOT} checkout ${KEY4HEPSPACK_VERSION}
 spack repo add --scope site "${KEY4HEPSPACK_ROOT}"
 EOF
 
+## Workaround for xrootd server, https://github.com/xrootd/xrootd/issues/2295
+ADD https://spaces.at.internet2.edu/download/attachments/24576265/InCommon%20RSA%20Server%20CA%202.pem?api=v2 /etc/ssl/certs/InCommon\ RSA\ Server\ CA\ 2.pem
 
 ## ========================================================================================
 ## STAGE1: builder