build: switch from nginx to Caddy

Dockerfile

@@ -5,13 +5,13 @@ RUN apk add --no-cache bash yq coreutils findutils
 WORKDIR /src
 COPY . .
 
-RUN chmod +x build.sh render.sh nginx/generate-nginx.sh && \
+RUN chmod +x build.sh render.sh && \
     ./build.sh
 
-FROM nginx:alpine
+FROM caddy:alpine
 
-COPY --from=builder /src/build/ /usr/share/nginx/html/
+COPY --from=builder /src/build/ /srv/
-COPY --from=builder /src/nginx/nginx.conf /etc/nginx/nginx.conf
+COPY --from=builder /src/Caddyfile /etc/caddy/Caddyfile
 
-RUN nginx -t
+RUN caddy validate --config /etc/caddy/Caddyfile
 EXPOSE 80