How to generate Genbank format out of paired end fastq data?
The steps needed to assemble a genome in Galaxy are layed out in the Assembly training material from the Galaxy Training network. The software for this should be available on the main galaxy servers (e.g., usegalaxy.eu). Since you have a prokaryote, I suggest you follow the "Unicycler Assembly" workflow, which is also available on usegalaxy.eu.