⚡️ Reduce the size of the backend docker image

backend/Dockerfile

@@ -1,9 +1,13 @@
 FROM python:3.11-slim as builder
 
 WORKDIR /app
-COPY . /app
 
-RUN apt update && apt install -y proj-bin
+COPY ./pyproject.toml /app
+
+RUN apt update && \
+	apt install -y --no-install-recommends proj-bin && \
+	apt clean && \
+	rm -rf /var/lib/apt/lists/*
 
 RUN pip install --upgrade poetry && \
     poetry config virtualenvs.create false && \
@@ -15,7 +19,11 @@ FROM python:3.11-slim as runtime
 COPY . /app
 COPY --from=builder /app/requirements.txt /app
 
-RUN apt update && apt install -y postgresql libpq5
+RUN apt update && \
+	apt install -y --no-install-recommends postgresql libpq5 && \
+	apt clean && \
+	rm -rf /var/lib/apt/lists/*
+
 RUN pip install --no-cache-dir -r /app/requirements.txt
 
 WORKDIR /app