Update Dockerfile to work with latest version of signalbackup-tools.
signalbackup-tools
has changed such that the Dockerfile no longer works. This PR:
- Calls
BUILDSCRIPT.bash
sinceBUILDSCRIPT.sh
no longer exists. - Adds
dbus-devel
to the dependency packages to install. - Updates Fedora to the latest version because the older version did not support the
-std=c++2b
flag now used by the build.