Recreated Dockerfile. Apparently the problem was with encoding.

Author: Hackitect7

nginx/Dockerfile

@@ -1,7 +1,8 @@
 # Dockerfile to build a custom Nginx image
 # We use the official lightweight nginx image based on Alpine Linux — small and fast
 
-FROM nginx:alpine  # Base image with Nginx and Alpine Linux to keep the image size minimal
+# Base image with Nginx and Alpine Linux to keep the image size minimal
+FROM nginx:alpine
 
 # Copy our custom Nginx configuration file into the container,
 # replacing the default config with one tailored to our app’s needs