TST: Make NamedTemporaryFiles Windows-compatible

Summary

For #199 (closed) Insert a meaningful description for this merge request here: What is the new/changed behavior? Which bug has been fixed? Are there related issues?

Focus

Point the reviewer to the core of the code change. Where should they start reading? What should they focus on (e.g. security, performance, maintainability, user-friendliness, compliance with the specs, finding more corner cases, concrete questions)?

Test Environment

How to set up a test environment for manual testing?

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• All automated tests pass
• Reference related issues
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• Up-to-date JSON schema (or not necessary)
• Appropriate user and developer documentation (or not necessary)
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Check List for the Reviewer

• I understand the intent of this MR
• All automated tests pass
• Up-to-date CHANGELOG.md (or not necessary)
• Appropriate user and developer documentation (or not necessary)
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For further good practices have a look at our review guidelines.

.docker/Dockerfile

+###############################
+###### Temporary Image ########
+###############################
+FROM debian:bookworm as git_base
+
+# Check for availability of DNS
+RUN if getent hosts indiscale.com > /dev/null; \
+    then echo "Connected to the internet and DNS available"; \
+    else echo "No internet connection or DNS not available"; \
+    fi
+
+COPY . /git
+
+# Delete .git because it is huge.
+RUN rm -r /git/.git
+
+# Install pycaosdb.ini for the tests
+RUN mv /git/.docker/tester_pycaosdb.ini /git/integrationtests/pycaosdb.ini
+
+###############################
+###### Main Image Build #######
+###############################
+
 FROM debian:bookworm
 RUN apt-get update && \
     apt-get install \
@@ -26,16 +49,8 @@ ADD https://gitlab.indiscale.com/api/v4/projects/104/repository/commits/${ADVANC
     advanced_version.json
 RUN git clone https://gitlab.indiscale.com/caosdb/src/caosdb-advanced-user-tools.git && \
     cd caosdb-advanced-user-tools && git checkout ${ADVANCED} && pip3 install --break-system-packages .[h5-crawler]
-COPY . /git
-
-# Delete .git because it is huge.
-RUN rm -r /git/.git
-
-# Install pycaosdb.ini for the tests
-RUN mv /git/.docker/tester_pycaosdb.ini /git/integrationtests/pycaosdb.ini
 
-# TODO Remove once https://github.com/ResearchObject/ro-crate-py/issues/203 has been resolved.
-RUN pip3 install --break-system-packages git+https://github.com/salexan2001/ro-crate-py.git@f-automatic-dummy-ids
+COPY --from=git_base /git /git
 
 RUN cd /git/ && pip3 install --break-system-packages .[h5-crawler,spss,rocrate]