creamos un texto a index.php Dockerfile

Dockerfile

@@ -0,0 +1,7 @@
+FROM debian:12.6
+RUN apt update -y
+RUN apt upgrade -y
+RUN apt install -y php
+
+COPY index.php index.php
+CMD ["bash", "-c", "php -S 0.0.0.0:7860 "]

index.php

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+HOLA SOY RAFA