upgrade build description

add debian package podman, link to docker doc and 5 minutes cycle

add 'docker.io' prefix in dockerfile

Dockerfile

@@ -1,4 +1,4 @@
-FROM nginx:1.29-alpine
+FROM docker.io/nginx:1.29-alpine
 
 COPY index.html poster.html /usr/share/nginx/html
 COPY assets /usr/share/nginx/html/assets

README.md

@@ -4,6 +4,14 @@
 
 We use Docker for deploying on the Interhack infra. Until we have a proper CI, we need to build manually.
 
+On Debian-based Linux distros, you can install the following package:
+
+```bash
+sudo apt install podman-docker
+```
+
+Otherwise, you can check-out [Docker install doc](https://docs.docker.com/engine/install/).
+
 First, login to the Docker registry:
 
 ```bash
@@ -17,6 +25,10 @@ docker build -t git.interhacker.space/interhack/camp-website-2026:latest .
 docker push git.interhacker.space/interhack/camp-website-2026:latest
 ```
 
+The pull process is triggered every five minutes.
+So you may wait at least this amount of time before the website is up-to-date !
+(and Crtl + Shift + R is usefful to nuke cache)
+
 ## generate status PDF
 
 Status are stored in [this online pad](https://md.interhacker.space/u2VNUSO6S36xx5Ensc3FCw).