Add support for immutable distributions

[R1kaB3rN]

Related to #73 and #71

Ensures that write permissions will be added to the destination files when copying from a read-only filesystem.

[R1kaB3rN]

cc @beh-10257

[beh-10257]

@R1kaB3rN so I tested this
it works great it even keeps permission for group and everyone which is great

for context I ran the first ls -lah before rebuilding umu with this pull request
so I nuked everything before seeing what will happen it worked perfectly so yeah this works
thanks for working on this

[R1kaB3rN]

for context I ran the first ls -lah before rebuilding umu with this pull request so I nuked everything before seeing what will happen it worked perfectly so yeah this works thanks for working on this

I just pushed some new changes and plan to merge this in main. If you can take the time to retest it again, that'd be great. If you encounter any issue again, please feel create another report.

Also, one of your environment variables is incorrect -- it's actually UMU_LOG not umu_LOG. The environment variable's name got messed up after the name change, which is why you're not seeing any logs at all.

@beh-10257

[beh-10257]

@R1kaB3rN if I can fix the man pages I will

and yeah I tested the change and they work great