setup ConanProfiles + reduce layers

Linux/BaseBuilder/Dockerfile

@@ -1,17 +1,28 @@
 FROM ubuntu:24.04
 
-ENV TZ=Europe/Paris
-ENV DEBIAN_FRONTEND=noninteractive
-ENV PATH="/root/.local/bin:$PATH"
+# Set timezone, noninteractive mode, and pipx path
+ENV TZ=Europe/Paris \
+    DEBIAN_FRONTEND=noninteractive \
+    PATH="/root/.local/bin:$PATH"
 
+# Use build cache for ccache
 RUN --mount=type=cache,target=/ccache
 
-# Make sudo dummy replacement, so we don't weaken docker security
-RUN echo "#!/bin/bash\n\$@" > /usr/bin/sudo
-RUN chmod +x /usr/bin/sudo
+# Dummy sudo (no security weakening)
+RUN echo '#!/bin/bash\n$@' > /usr/bin/sudo \
+    && chmod +x /usr/bin/sudo
 
-RUN apt-get update -y
-RUN apt-get install -y
+# Install base dependencies in one layer
+RUN apt-get update && apt-get install -y --no-install-recommends \
+        unzip \
+        curl \
+        wget \
+        lsb-release \
+        software-properties-common \
+        gnupg \
+        python3 \
+        python3-pip \
+    && rm -rf /var/lib/apt/lists/*
 
-RUN apt-get install unzip curl wget lsb-release software-properties-common gnupg -y
-RUN apt-get install python3 -y
+# Optional: Upgrade pip for Python3
+RUN python3 -m pip install --no-cache-dir --upgrade pip