core: clarify withMountedTemp docs that they are ephemeral

[sipsma]

Just a doc string update, but something odd is happening when I run ./hack/make sdk:elixir:generate locally:

✘ DaggerElixirSdk.generate: Directory! 11.8s
! call function "Generate": process "/runtime" did not complete successfully: exit code: 2
┃ marshal: json: error calling MarshalJSON for type *dagger.Directory: input: container.from.withWorkdir.withDirectory.withExec.withExec.withExec.withServiceBinding.withEnvVariable.withMountedFile.withEnvVariable.withExec.withMountedSecret.withWorkd
┃                                                                                                                                                                                                                                                        
┃ Stdout:                                                                                                                                                                                                                                                
┃ Resolving Hex dependencies...                                                                                                                                                                                                                          
┃ Stderr:                                                                                                                                                                                                                                                
┃ eheap_alloc: Cannot allocate 976733209832459912 bytes of memory (of type "heap_frag").                                                                                                                                                                 
┃                                                                                                                                                                                                                                                        
┃ Crash dump is being written to: erl_crash.dump...beam/erl_term.h:1492:tag_val_def() Assertion failed: tag_val_def error                                                                                                                                
  ✘ Container.directory(path: "gen"): Directory! 1.4s
  ! process "mix deps.get" did not complete successfully: exit code: 255
    ✘ exec mix deps.get 1.4s
    ! process "mix deps.get" did not complete successfully: exit code: 255
    ┃ Resolving Hex dependencies...                                                                                                                                                                                                                      
    ┃ eheap_alloc: Cannot allocate 976733209832459912 bytes of memory (of type "heap_frag").                                                                                                                                                             
    ┃                                                                                                                                                                                                                                                    
    ┃ Crash dump is being written to: erl_crash.dump...beam/erl_term.h:1492:tag_val_def() Assertion failed: tag_val_def error                                                                                                                            

Error: response from query: input: dagger.sdk.elixir.generate resolve: call function "Generate": process "/runtime" did not complete successfully: exit code: 2

Stdout:
marshal: json: error calling MarshalJSON for type *dagger.Directory: input: container.from.withWorkdir.withDirectory.withExec.withExec.withExec.withServiceBinding.withEnvVariable.withMountedFile.withEnvVariable.withExec.withMountedSecret.withWorkdir

Stdout:
Resolving Hex dependencies...
Stderr:
eheap_alloc: Cannot allocate 976733209832459912 bytes of memory (of type "heap_frag").

Crash dump is being written to: erl_crash.dump...beam/erl_term.h:1492:tag_val_def() Assertion failed: tag_val_def error
Error: exit status 1
exit status 1

@wingyplus any ideas why it would be trying to allocate 976733209832459912 bytes of memory? 😂 I'm gonna have to download more RAM if it's actually needed.

Not a blocker if no easy fix, I can resort to just hand editing the file for now since it's just a doc string update.

[wingyplus]

@sipsma it might be an issue with the Erlang/OTP that I upgrade recently. Found that one on Mac arm cpu (M* cpu family) here. Simple fix would be downgrading it. Let me submit a fix within today. 🙇‍♂️

[wingyplus]

@sipsma Just see the discussion on that Erlang issue that it already fix in 26.2.4 (we used 26.2.3). So submit a fix by upgrading it instead at #7283. If you found any issue, please ping me in the GitHub or Discord, I'll help investigate more on this as soon as possible. 🙇

[sipsma]

@wingyplus thank you so much for the quick fix! Works now 🎉

[sipsma]

There are some failures/cancelled-gha jobs here but they are due to some infra changes made a bit ago. Given this is just a doc string update I'm gonna go ahead and merge.