Scala runner doesn't do executable jars

[som-snytt]

Compiler version

3.0.0

Minimized code

➜  snips sdk use scala 2.13.6

Using scala version 2.13.6 in this shell.
➜  snips scalac -d hi.jar hi.scala
➜  snips scala hi.jar
hello, world
➜  snips sdk use scala 3.0.0

Using scala version 3.0.0 in this shell.
➜  snips scalac -d hi.jar hi.scala
➜  snips scala hi.jar
Error: Could not find or load main class hi.jar
Caused by: java.lang.ClassNotFoundException: hi.jar
➜  snips scala -classpath hi.jar Main
hello, world

Output

Error: Could not find or load main class hi.jar

Expectation

Scala runner creates and runs an executable jar. It looks like it doesn't create META-INF/MANIFEST.MF.

[okarmusk]

I've got the same issue when run scala 3 from binary.
Bug is visible even if jar is build from sbt package where sbt is in version 1.5.2. Please check issue what has been added by @adpi2

[okarmusk]

I built the same source code with the same sbt version but I compile and run it with scala 2.13.6, it works.
Issue exists only in scala 3.

[som-snytt]

I'll take a swing at this, since it's such a useful niche feature. By swing, I mean a bunt down the 3rd base line.

[dwijnand]

Overlaps with #13081, so either make sure to coordinate with @BarkingBad.

[BarkingBad]

I tested it @anatoliykmetyuk and compiling files using scalac -d hi.jar hi.scala doesn't provide Manifest file. The way to get runnable jar is to run it by scala -save hi.scala and then run it as scala hi.jar

Should we introduce change to scalac that would make Manifest file?