Use officiel Riot docker image

riot/Dockerfile

-FROM nginx:alpine
-
-ARG version
-ARG gpg_key
-
-# Download Riot Web, verify with GPG, then install
-RUN apk add --no-cache --virtual .build-deps curl gnupg &&\
-    curl -sSL https://github.com/vector-im/riot-web/releases/download/${version}/riot-${version}.tar.gz -o riot-web.tar.gz &&\
-    curl -sSL https://github.com/vector-im/riot-web/releases/download/${version}/riot-${version}.tar.gz.asc -o riot-web.tar.gz.asc &&\
-    for server in \
-        hkp://keyserver.ubuntu.com:80 \
-        hkp://p80.pool.sks-keyservers.net:80 \
-        ha.pool.sks-keyservers.net \
-    ; do \
-        echo "Fetching GPG key $gpg_key from $server"; \
-        gpg --keyserver "$server" --keyserver-options timeout=10 --recv-keys "$gpg_key" && break; \
-    done &&\ 
-    gpg --batch --verify riot-web.tar.gz.asc riot-web.tar.gz &&\
-    tar -xzf riot-web.tar.gz &&\
-    mv riot-${version} /etc/riot-web &&\
-    cp /etc/riot-web/config.sample.json /etc/riot-web/config.json &&\
-    rm -rf /usr/share/nginx/html && ln -s /etc/riot-web /usr/share/nginx/html &&\
-    rm riot-web.tar.gz* &&\
-    apk del .build-deps

riot/docker-compose.yml

@@ -2,14 +2,10 @@ version: "3.7"
 
 services:
   riot:
-    build:
-      context: .
-      args:
-        version: v1.3.6
-        gpg_key: 5EA7E0F70461A3BCBEBE4D5EF6151806032026F9
+    image: vectorim/riot-web
     volumes:
-      # Make Riot default to auro.re matrix server
-      - ./config.json:/etc/riot-web/config.json:ro
+      # Make Riot default to our matrix server
+      - ./config.json:/app/config.json:ro
     ports:
       - 8080:80
     restart: always