Restructuring build flows to choose user as default but be overridable

itdominator-gui-base-image/Dockerfile

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+# 1. A: Define a base image
+FROM itdominator-base
+
+ARG USERNAME=itdominator
+
+# 1. B: Set ENV Variables
+ENV DISPLAY=:0
+
+ENV NVM_VERSION=0.40.3
+ENV NODE_VERSION=24.9.0
+ENV PYTHON_VERSION=3.12.12
+ENV PYTHON_SUB_VERSION=3.12
+
+ENV NVM_DIR="/root/.nvm"
+ENV PYENV_ROOT="/opt/pyenv"
+
+ENV PATH="${NVM_DIR}/versions/node/v${NODE_VERSION}/bin/:${PATH}" 
+ENV PATH="${PYENV_ROOT}/bin:${PYENV_ROOT}/shims:${PATH}"
+ENV PATH="/opt:${PATH}"
+
+ENV PYTHONDONTWRITEBYTECODE=1
+ENV PYTHONUNBUFFERED=1
+
+# 2. Set the working directory inside the container
+WORKDIR /home/${USERNAME}/
+
+# 3. A: Install dependencies
+RUN apt-get update && apt-get install -y \
+    --no-install-recommends \
+    --no-install-suggests \
+    libgl1-mesa-dri \
+    libgl1 \
+    libegl1 \
+    libx11-6 \
+    libxext6 \
+    libxrender1 \
+    libxi6 \
+    libxtst6 \
+    dbus-x11 \
+    x11-apps \
+    x11-utils \
+    xdg-utils \
+    xauth \
+    fontconfig \
+    fonts-dejavu-core \
+    fonts-dejavu \
+    fonts-dejavu-extra \
+    python3-gi \
+    python3-gi-cairo \
+    libgtk-3-0 \
+    libgtk-3-bin \
+    libatk1.0-0 \
+    libgdk-pixbuf-2.0-0 \
+    libpango-1.0-0 \
+    libpangocairo-1.0-0 \
+    libcairo2 \
+    libcairo-gobject2 \
+    libglib2.0-0 \
+    libgtksourceview-4-0 \
+    libatk-bridge2.0-0 \
+    gir1.2-gtk-3.0 \
+    gir1.2-glib-2.0 \
+    gir1.2-gdkpixbuf-2.0 \
+    gir1.2-pango-1.0 \
+    gir1.2-appindicator3-0 \
+    gir1.2-gtksource-4 \
+    gir1.2-gtksource-3.0 \
+    gir1.2-webkit2-4.1 \
+    gir1.2-vte-2.91 \
+    gir1.2-notify-0.7 \
+    gir1.2-glib-2.0 \
+    gir1.2-secret-1 \
+    gir1.2-keybinder-3.0
+
+    # --- AppIndicator (system tray) ---
+    # gir1.2-ayatanaappindicator3-0 \   # modern (try first)
+    # libayatana-appindicator3 \
+
+COPY requirements.txt .
+RUN curl -fsSL https://pyenv.run | bash
+RUN pyenv install ${PYTHON_VERSION} && pyenv global ${PYTHON_VERSION} && pyenv local ${PYTHON_VERSION}
+RUN pip install --no-cache-dir -r requirements.txt
+
+RUN curl -o- https://raw.githubusercontent.com/nvm-sh/nvm/v"${NVM_VERSION}"/install.sh | bash
+RUN . "${NVM_DIR}/nvm.sh" && nvm install ${NODE_VERSION}
+RUN . "${NVM_DIR}/nvm.sh" && nvm use v${NODE_VERSION}
+RUN . "${NVM_DIR}/nvm.sh" && nvm alias default v${NODE_VERSION}
+
+RUN node --version
+RUN npm --version
+
+# 4. ...
+
+# 5. Cleanup
+RUN apt-get autoremove -y --purge
+RUN apt-get autoclean
+
+RUN rm -rf /var/lib/apt/lists/*
+RUN rm -rf /tmp/*
+RUN rm requirements.txt
+
+# 6. Expose Port and define the command used to run the app
+CMD ["bash"]