### Steps to reproduce

1. Begin of the insertionInstall BIM edition via k8s

2. Make sure `global.containerSecurityContext.readOnlyRootFilesystem` is set to true (default on many k8s clusters)

3. End of the insertion Try importing an IFC file 

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<br>


### What is the buggy behavior?

* You can get an error:

openproject-worker-default-7f65b7df6b-hfcgs openproject E, \[2025-05-30T08:08:24.601783 #7\] ERROR -- : \[Activelob\] \[Bim::IfcModels::IfcConversionJob\] \[3b3cd60b-d899-de
da-986e-daaefblbe69d\] Failed to convert IFC model #&lt;Bim::IfcModels::IfcModel conversion\_status: &quot;error®, title: &quot;D7-301&quot;, id: 5, created\_at: &quot;2025-05-30 08:08:22.6135
37000 +0000&quot;, updated\_at: &quot;2025-05-30 08:08:24.587430261 +0000&quot;, project\_id: 13, uploader\_id: 8, is\_default: false, conversion\_error\_message: &quot;Failed to convert model
to dae: terminate called a Failed to convert model to dae: terminate called after throwing an instance of &#39;COLLADASW: :StreamwWriterException

<br> Begin of the deletion

* Unfortunately this only happens on some systems

* When running the command manually `IfcConvert --use-element-guids --no-progress --verbose --threads 4 /tmp/minimal.ifc /tmp/minimal.dae --exclude entities IfcOpeningElement` you get the following error:
IfcOpenShell IfcConvert 0.7.11-fea8e3a5c (0CC 7.5.3)

Creating geometry...
Done creating geometry (215 objects)
Done writing geometry (215 objects)
Unable to write output file &amp;#39;/tmp/minimal.dae&amp;#39;, see &amp;#39;.ifcopenshell.QOLQZUTP.tmp&amp;#39; for the conversion result.
Log:

\[Notice\] \[2025-06-10 11:45:54\] exclude entities IfcOpeningElement
\[Notice\] \[2025-06-10 11:45:55\] Created 43 tasks for 215 products
\[Notice\] \[2025-06-10 11:45:55\] Initializing mapping took 23.924104ms
\[Notice\] \[2025-06-10 11:45:55\] Performing mapping took 0.020219ms
\[Notice\] \[2025-06-10 11:45:55\] Geometry interpretation took 32.721024ms

\[Notice\] \[2025-06-10 11:45:55\] Geometry interpretation took 32.721024ms

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* When using `-threads 64` or not using the `--threads` parameter at all, it worksEnd of the deletion


### What is the expected behavior?

1. Allow to configure the number of threads so that the users can configure a setting that works on their Begin of the insertionsystemEnd of the insertion Begin of the deletion system End of the deletion

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Begin of the insertion### AnalyzeEnd of the insertion Begin of the deletion &lt;br&gt;End of the deletion

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Begin of the insertion[Dir.mktmpdir](https://github.com/opf/openproject/blob/v16.0.1/modules/bim/app/services/bim/ifc_models/view_converter_service.rb#L60)  is trying to create the folder in `/app/<random_folder_name>` it should create the folder in `/tmp/<random_folder_name>` or in `/app/tmp/<random_folder_name>` instead.

Also, IfcConvert is writing a temporary file to `pwd` dring conversion what is also `/app` on default, so the directory needs to be changed before calling `IfcConvert`

End of the insertion ### Begin of the insertionWorkaround

<br>

Building a custom container with the Dockerfile and the view\_converter\_service.rb attached to this work package and use it instead of the official container.

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<br>End of the insertion