fix: launch firefox with user 1001

For some reason, cypress does not detect firefox, which
could be because you need to run as a non-root user, cfr:

cypress-io/github-action#104

.github/workflows/verify.yml

@@ -57,7 +57,9 @@ jobs:
 
   firefox:
     runs-on: ubuntu-latest
-    container: cypress/browsers:node14.16.0-chrome89-ff86
+    container:
+      image: cypress/browsers:node14.16.0-chrome89-ff86
+      options: --user 1001
     services:
       gstreamer:
         image: steabert/gst-rtsp-launch
@@ -76,7 +78,7 @@ jobs:
       - name: Build
         run: yarn build
       - name: Test basic video functionality
-        run: sbin/test.sh firefox
+        run: sbin/test.sh /usr/bin/firefox
 
   edge:
     runs-on: ubuntu-latest