Install python packages for docker image into venv envirounment

Dockerfile

@@ -1,45 +1,57 @@
+# Stage 1: Build the Java application JAR
 FROM maven:3-eclipse-temurin-21 as jar_builder
 
 # Set the working directory in the Maven image
 WORKDIR /app
 
-# Copy the java source files and the pom.xml file into the image
+# Copy the Java source files and the pom.xml file into the image
 COPY src ./src
 COPY pom.xml .
 
 # Build the application
 RUN mvn clean package -DskipTests
 
+# Stage 2: Prepare the final image
 FROM maven:3-eclipse-temurin-21
 
-# download system dependencies first to take advantage of docker caching
-RUN apt-get update; apt-get install -y --no-install-recommends \
+# Download system dependencies first to take advantage of Docker caching
+RUN apt-get update && apt-get install -y --no-install-recommends \
         build-essential \
         default-mysql-client \
         default-libmysqlclient-dev \
         python3 \
-        python3-setuptools \
+        python3-venv \
         python3-dev \
-        python3-pip \
         unzip \
         perl \
-    && rm -rf /var/lib/apt/lists/* \
-    && pip3 install wheel
+    && rm -rf /var/lib/apt/lists/*
 
-# Install any needed packages specified in requirements.txt
+# Set up a Python virtual environment
+RUN python3 -m venv /opt/venv
+ENV PATH="/opt/venv/bin:$PATH"
+
+# Install Python packages in the virtual environment
 COPY requirements.txt ./
 RUN pip install --no-cache-dir -r requirements.txt
 
-RUN ln -s $(which python3) /usr/local/bin/python || true
+# Link python3 to python for compatibility
+RUN ln -s /opt/venv/bin/python /usr/local/bin/python || true
 
+# Copy the built JAR from the first stage
 COPY --from=jar_builder /app/core-*.jar /
+
+# Copy and set permissions for scripts
 COPY scripts/ scripts/
 RUN chmod -R a+x /scripts/
 
 # Set the working directory in the container
 WORKDIR /scripts/
 
+# Environment variable
 ENV PORTAL_HOME=/
 
-# This file is empty. It has to be overriden by bind mounting the actual application.properties
+# Create an empty application.properties file
 RUN touch /application.properties
+
+# Entry command
+CMD ["python", "your_script.py"]