Improve Dockerfile syntax

Dockerfile

@@ -1,17 +1,24 @@
 FROM python:3.9-slim AS builder
 
 # Install build dependencies
-RUN apt-get update && apt-get install -y --no-install-recommends \
-    build-essential \
-    libpq-dev \
-    gcc \
-    && rm -rf /var/lib/apt/lists/*
+RUN set -euxo pipefail; \
+    export DEBIAN_FRONTEND=noninteractive; \
+    apt-get update; \
+    apt-get install -y --no-install-recommends \
+        build-essential \
+        libpq-dev \
+        gcc \
+        ;
 
 WORKDIR /app
 
 # Install Python packages
 COPY requirements.txt .
-RUN pip install --upgrade pip setuptools wheel && \
+RUN set -euxo pipefail; \
+    pip install --upgrade \
+        pip \
+        setuptools \
+        wheel; \
     pip install -r requirements.txt
 
 # Final application image
@@ -20,12 +27,15 @@ FROM python:3.9-slim AS app
 WORKDIR /app
 
 # Install runtime dependencies
-RUN apt-get update && apt-get install -y --no-install-recommends \
-    libpq5 \
-    && rm -rf /var/lib/apt/lists/*
+RUN set -euxo pipefail; \
+    export DEBIAN_FRONTEND=noninteractive; \
+    apt-get update; \
+    apt-get install -y --no-install-recommends \
+        libpq5 \
+        ;
 
 # Copy pre-installed Python packages from builder
 COPY --from=builder /usr/local /usr/local/
 
 COPY . .
-CMD ["/bin/bash", "run.sh"]
+CMD ["/app/run.sh"]