Optimize Dockerfiles (#4069)

# Description of Changes

Summary from GitHub Copilot:

> Optimize Dockerfiles
> 
> This pull request includes updates to multiple Dockerfiles to improve
efficiency, simplify permissions management, and enhance consistency
across development environments. The most important changes involve
optimizing `pip` installations, consolidating `chmod` commands, and
removing redundant script permissions.
> 
> ### Efficiency Improvements:
> * Updated `pip install` commands in `Dockerfile`, `Dockerfile.dev`,
and `Dockerfile.fat` to use the `--no-cache-dir` flag, reducing disk
usage during package installations.
[[1]](diffhunk://#diff-dd2c0eb6ea5cfc6c4bd4eac30934e2d5746747af48fef6da689e85b752f39557L81-R81)
[[2]](diffhunk://#diff-86930c95a19b82f7e64a962a0053d44e855824813019b3698eae4917a90cdcacL39-R39)
[[3]](diffhunk://#diff-571631582b988e88c52c86960cc083b0b8fa63cf88f056f26e9e684195221c27L94-R94)
> 
> ### Permissions Management:
> * Consolidated `chmod` commands for scripts in `Dockerfile.dev` to
simplify permissions setup. Combined `git-init.sh` and `init-setup.sh`
into a single command.
> * Removed redundant `chmod +x` for `init.sh` in `Dockerfile` and
`Dockerfile.fat`, as permissions for `/scripts/*` already cover this
file.
[[1]](diffhunk://#diff-dd2c0eb6ea5cfc6c4bd4eac30934e2d5746747af48fef6da689e85b752f39557L92)
[[2]](diffhunk://#diff-571631582b988e88c52c86960cc083b0b8fa63cf88f056f26e9e684195221c27L105)

---

## Checklist

### General

- [x] I have read the [Contribution
Guidelines](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/CONTRIBUTING.md)
- [x] I have read the [Stirling-PDF Developer
Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/DeveloperGuide.md)
(if applicable)
- [ ] I have read the [How to add new languages to
Stirling-PDF](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/HowToAddNewLanguage.md)
(if applicable)
- [x] I have performed a self-review of my own code
- [x] My changes generate no new warnings

### Documentation

- [ ] I have updated relevant docs on [Stirling-PDF's doc
repo](https://github.com/Stirling-Tools/Stirling-Tools.github.io/blob/main/docs/)
(if functionality has heavily changed)
- [ ] I have read the section [Add New Translation
Tags](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/HowToAddNewLanguage.md#add-new-translation-tags)
(for new translation tags only)

### UI Changes (if applicable)

- [ ] Screenshots or videos demonstrating the UI changes are attached
(e.g., as comments or direct attachments in the PR)

### Testing (if applicable)

- [ ] I have tested my changes locally. Refer to the [Testing
Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/devGuide/DeveloperGuide.md#6-testing)
for more details.

Dockerfile

@@ -78,7 +78,7 @@ RUN echo "@main https://dl-cdn.alpinelinux.org/alpine/edge/main" | tee -a /etc/a
     # URW Base 35 fonts for better PDF rendering
     font-urw-base35 && \
     python3 -m venv /opt/venv && \
-    /opt/venv/bin/pip install --upgrade pip setuptools && \
+    /opt/venv/bin/pip install --no-cache-dir --upgrade pip setuptools && \
     /opt/venv/bin/pip install --no-cache-dir --upgrade unoserver weasyprint && \
     ln -s /usr/lib/libreoffice/program/uno.py /opt/venv/lib/python3.12/site-packages/ && \
     ln -s /usr/lib/libreoffice/program/unohelper.py /opt/venv/lib/python3.12/site-packages/ && \
@@ -89,7 +89,6 @@ RUN echo "@main https://dl-cdn.alpinelinux.org/alpine/edge/main" | tee -a /etc/a
     ln -s /usr/share/fontconfig/conf.avail/69-urw-*.conf /etc/fonts/conf.d/ && \
     fc-cache -f -v && \
     chmod +x /scripts/* && \
-    chmod +x /scripts/init.sh && \
     # User permissions
     addgroup -S stirlingpdfgroup && adduser -S stirlingpdfuser -G stirlingpdfgroup && \
     chown -R stirlingpdfuser:stirlingpdfgroup $HOME /scripts /usr/share/fonts/opentype/noto /configs /customFiles /pipeline /tmp/stirling-pdf && \

Dockerfile.dev

@@ -36,7 +36,7 @@ ENV SETUPTOOLS_USE_DISTUTILS=local \
 # Installation der benötigten Python-Pakete
 RUN python3 -m venv --system-site-packages /opt/venv \
   && . /opt/venv/bin/activate \
-  && pip install --upgrade pip setuptools \
+  && pip install --no-cache-dir --upgrade pip setuptools \
   && pip install --no-cache-dir WeasyPrint pdf2image pillow unoserver opencv-python-headless pre-commit
 
 # Füge den venv-Pfad zur globalen PATH-Variable hinzu, damit die Tools verfügbar sind
@@ -54,8 +54,7 @@ RUN echo "devuser ALL=(ALL) NOPASSWD:ALL" > /etc/sudoers.d/devuser \
 # Setze das Arbeitsverzeichnis (wird später per Bind-Mount überschrieben)
 WORKDIR /workspace
 
-RUN chmod +x /workspace/.devcontainer/git-init.sh
-RUN sudo chmod +x /workspace/.devcontainer/init-setup.sh
+RUN chmod +x /workspace/.devcontainer/git-init.sh /workspace/.devcontainer/init-setup.sh
 
 # Wechsel zum Nicht‑Root Benutzer
 USER devuser

Dockerfile.fat

@@ -91,7 +91,7 @@ RUN echo "@main https://dl-cdn.alpinelinux.org/alpine/edge/main" | tee -a /etc/a
     py3-pillow@testing \
     py3-pdf2image@testing && \
     python3 -m venv /opt/venv && \
-    /opt/venv/bin/pip install --upgrade pip setuptools && \
+    /opt/venv/bin/pip install --no-cache-dir --upgrade pip setuptools && \
     /opt/venv/bin/pip install --no-cache-dir --upgrade unoserver weasyprint && \
     ln -s /usr/lib/libreoffice/program/uno.py /opt/venv/lib/python3.12/site-packages/ && \
     ln -s /usr/lib/libreoffice/program/unohelper.py /opt/venv/lib/python3.12/site-packages/ && \
@@ -102,7 +102,6 @@ RUN echo "@main https://dl-cdn.alpinelinux.org/alpine/edge/main" | tee -a /etc/a
     ln -s /usr/share/fontconfig/conf.avail/69-urw-*.conf /etc/fonts/conf.d/ && \
     fc-cache -f -v && \
     chmod +x /scripts/* && \
-    chmod +x /scripts/init.sh && \
     # User permissions
     addgroup -S stirlingpdfgroup && adduser -S stirlingpdfuser -G stirlingpdfgroup && \
     chown -R stirlingpdfuser:stirlingpdfgroup $HOME /scripts /usr/share/fonts/opentype/noto /configs /customFiles /pipeline /tmp/stirling-pdf && \