Move nginx copy command to after installation

docker/tna-python/Dockerfile

@@ -93,13 +93,6 @@ ENV POETRY_HOME=/home/app/.local \
 # ==========================================
 SHELL ["/bin/bash", "-o", "pipefail", "-c"]
 
-# ==========================================
-# Copy in the nginx configuration file which
-# allows us to use a reverse proxy and serve
-# the application through HTTPS
-# ==========================================
-COPY lib/nginx.conf /etc/nginx/nginx.conf
-
 # ==========================================
 # 1.
 # Update the package index files and install
@@ -149,6 +142,15 @@ RUN set -eux; \
     chown app:app -R /app; \
     chmod 700 /app
 
+# ==========================================
+# Copy in the nginx configuration file which
+# allows us to use a reverse proxy and serve
+# the app securely through HTTPS - this will
+# replace the default configuration provided
+# by nginx
+# ==========================================
+COPY lib/nginx.conf /etc/nginx/nginx.conf
+
 # ==========================================
 # Set $HOME env var to be the home directory
 # of our new app user so we can install libs