Update Dockerfile

Dockerfile

@@ -6,11 +6,20 @@ ENV POSTGRES_DB=mydb
 ENV POSTGRES_USER=myuser
 ENV POSTGRES_PASSWORD=mypassword
 
-# Copy any custom SQL scripts to the container
+# Create a custom user and group for PostgreSQL
+RUN groupadd -r postgres && useradd -r -g postgres postgres
+
+# Set the ownership of the data directory
+RUN mkdir -p /var/lib/postgresql/data && chown -R postgres:postgres /var/lib/postgresql/data
+
+# Copy the init.sql file to the container
 COPY init.sql /docker-entrypoint-initdb.d/
 
 # Expose the default PostgreSQL port
 EXPOSE 5432
 
+# Run the PostgreSQL process as the custom user
+USER postgres
+
 # Start the PostgreSQL server when the container is launched
 CMD ["postgres"]