docker multistage build

docker/dockerfile

@@ -1,4 +1,5 @@
 # --- Stage 1: Python Backend dev ---
+
 FROM python:3.14-slim AS dev
 
 LABEL org.opencontainers.image.title="The-DisExcel-project-dev"
@@ -14,6 +15,28 @@ RUN pip install --no-cache-dir --break-system-packages poetry \
     && poetry config virtualenvs.create false \
     && poetry install --no-root --no-interaction
 
+
+# --- Stage 1: Python Backend builder ---
+
+FROM python:3.14-slim AS builder
+
+LABEL org.opencontainers.image.title="The-DisExcel-project-dev"
+LABEL org.opencontainers.image.source="https://git.homyk.space/MH.Dmitrii/The_DisExcel_project"
+
+WORKDIR /home/excel-project
+
+ENV VIRTUAL_ENV=/opt/venv
+ENV PATH="$VIRTUAL_ENV/bin:$PATH"
+
+RUN python -m venv "$VIRTUAL_ENV"
+
+COPY pyproject.toml poetry.lock ./
+
+RUN pip install --no-cache-dir poetry \
+    && poetry config virtualenvs.create false \
+    && poetry install --no-root --no-interaction --only main \
+    && pip uninstall -y poetry poetry-core poetry-plugin-export 
+
 # --- Stage 2: Python Backend prod ---
 
 FROM python:3.14-slim AS prod
@@ -23,15 +46,16 @@ LABEL org.opencontainers.image.source="https://git.homyk.space/MH.Dmitrii/The_Di
 
 WORKDIR /home/excel-project
 
+ENV VIRTUAL_ENV=/opt/venv
+ENV PATH="$VIRTUAL_ENV/bin:$PATH"
+
+COPY --from=builder /opt/venv /opt/venv
+
 COPY pyproject.toml poetry.lock main.py docker/entrypoint.sh alembic.ini ./
 COPY src/ ./src/
 
 RUN chmod +x ./entrypoint.sh
 
-RUN pip install --no-cache-dir --break-system-packages poetry \
-    && poetry config virtualenvs.create false \
-    && poetry install --no-root --no-interaction --only main
-
 RUN groupadd --gid 1000 appuser \
     && useradd --uid 1000 --gid appuser --shell /bin/bash --create-home appuser \
     && chown -R appuser:appuser /home/excel-project