Added base documentation and caddy-duckdns Dockerfile

README.adoc

@@ -0,0 +1,30 @@
+= Docker
+
+This repository contains custom Dockerfiles whose images will be stored on this Gitea container registry.
+
+
+== How to use
+
+To use the container registry you must login using your credentials. If you have enabled two-factors authentication, you will need to create an application token with repository read access. More informations on https://docs.gitea.com/usage/packages/container[Gitea documentation].
+
+[source,shell]
+----
+docker login git.syyrell.com
+docker pull git.syyrell.com/{owner}/{image}:{tag}
+docker push git.syyrell.com/{owner}/{image}:{tag}
+----
+
+== Dockerfiles available
+
+=== caddy-duckdns.Dockerfile
+
+Caddy base image with https://github.com/caddy-dns/duckdns[duckdns module] added. There is a `VERSION` variable required to chose which Caddy version to use.
+
+[source,shell]
+----
+docker build --build-arg VERSION=2.7.6 -f ./caddy-duckdns.Dockerfile -t caddy-duckdns:2.7.6 .
+----
+
+Existing pre-built images :
+
+* git.syyrell.com/syrell/caddy-duckdns:2.7.6

caddy-duckdns.Dockerfile

@@ -0,0 +1,8 @@
+ARG VERSION=latest
+FROM caddy:${VERSION}-builder AS builder
+
+RUN xcaddy build \
+    --with github.com/caddy-dns/duckdns
+
+FROM caddy:${VERSION}
+COPY --from=builder /usr/bin/caddy /usr/bin/caddy