Fix dockerfile_templates/conan.txt where '--break-system-packages' was breaking docker build

Author: atasoglou

turludock/assets/dockerfile_templates/conan.txt

@@ -2,6 +2,6 @@
 RUN apt-get update && apt-get install -y python3-pip && \
     apt-get clean && rm -rf /var/lib/apt/lists/*
 
-RUN pip install --user --no-cache-dir --break-system-packages --upgrade pip && \
-    pip install --user --no-cache-dir --break-system-packages --ignore-installed PyYAML && \
-    pip install --user --no-cache-dir --break-system-packages conan
+RUN pip install --no-cache-dir --break-system-packages --upgrade pip || pip install --no-cache-dir --upgrade pip && \
+    pip install --no-cache-dir --break-system-packages --ignore-installed PyYAML && \
+    pip install --no-cache-dir --break-system-packages conan