Update Docker file to handle secrets and set environment variables

### Update Docker file to handle secrets and set environment variables

Dockerfile

@@ -1,5 +1,16 @@
 FROM python:3.11.9-slim
 
+
+# Expose the secret SECRETS at buildtime
+RUN --mount=type=secret,id=REDIS_URL,mode=0444,required=true
+RUN --mount=type=secret,id=REDIS_USERNAME,mode=0444,required=true
+RUN --mount=type=secret,id=REDIS_PASSWORD,mode=0444,required=true
+
+# Set environment variables
+ENV REDIS_URL=$(cat /run/secrets/REDIS_URL)
+ENV REDIS_USERNAME=$(cat /run/secrets/REDIS_USERNAME)
+ENV REDIS_PASSWORD=$(cat /run/secrets/REDIS_PASSWORD)
+
 # Copy requirements file
 COPY requirements_docker.txt .