fix: start web services in Portainer Swarm

deploy/Dockerfile.web

@@ -18,5 +18,10 @@ ENV WEB_INDEX=index.html PUBLIC_HOST=invalid.example S3_PUBLIC_ENDPOINT=https://
 COPY --from=policy /build/default.conf.template /etc/nginx/templates/default.conf.template
 COPY dtf-site.html /usr/share/nginx/html/index.html
 COPY local/static/ /usr/share/nginx/html/
+# The official entrypoint renders the server configuration at startup and Nginx
+# writes its PID/cache files.  Keep the service non-root while granting it
+# ownership of only those runtime locations.  This works in Docker Swarm,
+# where the previous read-only/tmpfs combination was not mounted as expected.
+RUN chown -R 101:101 /etc/nginx/conf.d /var/cache/nginx /run
 USER 101:101
 EXPOSE 8080

docker-compose.yml

@@ -124,12 +124,6 @@ services:
         published: ${SITE_PORT:-18080}
         protocol: tcp
         mode: ingress
-    read_only: true
-    tmpfs:
-      - /tmp:uid=101,gid=101,mode=0750
-      - /var/cache/nginx:uid=101,gid=101,mode=0750
-      - /var/run:uid=101,gid=101,mode=0750
-      - /etc/nginx/conf.d:uid=101,gid=101,mode=0750
     healthcheck:
       test: [CMD-SHELL, 'wget -q --header="Host: $$PUBLIC_HOST" -O /dev/null http://127.0.0.1:8080/health']
       interval: 15s
@@ -152,12 +146,6 @@ services:
         published: ${KANBAN_PORT:-18081}
         protocol: tcp
         mode: ingress
-    read_only: true
-    tmpfs:
-      - /tmp:uid=101,gid=101,mode=0750
-      - /var/cache/nginx:uid=101,gid=101,mode=0750
-      - /var/run:uid=101,gid=101,mode=0750
-      - /etc/nginx/conf.d:uid=101,gid=101,mode=0750
     healthcheck:
       test: [CMD-SHELL, 'wget -q --header="Host: $$PUBLIC_HOST" -O /dev/null http://127.0.0.1:8080/health']
       interval: 15s