centralizácia nastavení do .devcontainer/.env

Dockerfile

@@ -1,14 +1,20 @@
 # syntax=docker/dockerfile:1.6
 
-ARG PYTHON_BASE=3.13
-FROM python:${PYTHON_BASE}-slim
+ARG PYTHON_BASE=3.13
+ARG PIP_INDEX_URL=https://dv.masara.eu/repository/pypi-group/simple
+ARG APP_USER_ID=1000
+FROM python:${PYTHON_BASE}-slim
+
+# Re-declare build args for use in this build stage.
+ARG PIP_INDEX_URL
+ARG APP_USER_ID
 
-ENV PYTHONDONTWRITEBYTECODE=1 \
-    PYTHONUNBUFFERED=1 \
-    PIP_NO_CACHE_DIR=1 \
-    PIP_DISABLE_PIP_VERSION_CHECK=1 \
-    PIP_INDEX_URL=https://dv.masara.eu/repository/pypi-group/simple \
-    PIP_NO_INPUT=1
+ENV PYTHONDONTWRITEBYTECODE=1 \
+    PYTHONUNBUFFERED=1 \
+    PIP_NO_CACHE_DIR=1 \
+    PIP_DISABLE_PIP_VERSION_CHECK=1 \
+    PIP_INDEX_URL=${PIP_INDEX_URL} \
+    PIP_NO_INPUT=1
 
 WORKDIR /app
 
@@ -21,9 +27,8 @@ RUN --mount=type=cache,target=/root/.cache/pip \
 COPY app/ /app/
 
 # Vytvorenie ne-root usera
-ARG APP_USER_ID=1000
-RUN useradd -u ${APP_USER_ID} -m appuser && \
-    chown -R appuser:appuser /app
+RUN useradd -u ${APP_USER_ID} -m appuser && \
+    chown -R appuser:appuser /app
 
 USER appuser