install nginx from its repository

Dockerfile

@@ -1,6 +1,19 @@
 FROM python:3.13-slim
 
+
+# nginx pre-requisites
 RUN apt update && apt upgrade -y
+
+RUN apt install curl gnupg2 ca-certificates lsb-release debian-archive-keyring -y
+RUN curl https://nginx.org/keys/nginx_signing.key | gpg --dearmor \
+    | tee /usr/share/keyrings/nginx-archive-keyring.gpg >/dev/null
+RUN echo "deb [signed-by=/usr/share/keyrings/nginx-archive-keyring.gpg] \
+    http://nginx.org/packages/debian `lsb_release -cs` nginx" \
+    | tee /etc/apt/sources.list.d/nginx.list
+RUN echo "Package: *\nPin: origin nginx.org\nPin: release o=nginx\nPin-Priority: 900\n" \
+    | tee /etc/apt/preferences.d/99nginx
+
+RUN apt update
 RUN apt install nginx ca-certificates -y
 
 COPY requirements.txt .