Fix cypress suite

- split out cypress tests for plugins to be isolated
- use updated testca image from proper location

docker/Dockerfile

@@ -38,15 +38,17 @@ EXPOSE 80 81 443
 
 COPY backend       /app
 COPY frontend/dist /app/frontend
+COPY docker/rootfs /
+
+# Copy test CA cert for use in container and add to trusted certs from a self-signed CA
+COPY --from=testca /home/step/certs/root_ca.crt /etc/ssl/certs/NginxProxyManager.crt
+WORKDIR /etc/ssl/certs
+RUN ln -s NginxProxyManager.crt 1d0e3f10.0 && update-ca-certificates
 
 WORKDIR /app
 RUN yarn install \
 	&& yarn cache clean
 
-# add late to limit cache-busting by modifications
-COPY docker/rootfs /
-COPY --from=testca /home/step/certs/root_ca.crt /etc/ssl/certs/NginxProxyManager.crt
-
 # Remove frontend service not required for prod, dev nginx config as well
 RUN rm -rf /etc/s6-overlay/s6-rc.d/user/contents.d/frontend /etc/nginx/conf.d/dev.conf \
 	&& chmod 644 /etc/logrotate.d/nginx-proxy-manager