test(cypress): only run in parallel for pull requests

Results from pushes are not time critical.
Save some resources by avoiding the overhead of parallelization.

Signed-off-by: Max <max@nextcloud.com>

.github/workflows/cypress.yml

@@ -7,10 +7,11 @@ on:
       - main
       - master
       - stable*
+      - test/slow-cypress-on-push
 
 concurrency:
   group: ${{ github.head_ref || github.run_id }}
-  cancel-in-progress: true
+  cancel-in-progress: ${{ !github.head_ref }}
 
 env:
   APP_NAME: text
@@ -80,7 +81,7 @@ jobs:
       fail-fast: false
       matrix:
         node-version: [16]
-        containers: [1, 2, 3, 4, 5, 6, 7, 8]
+        containers: ${{ github.head_ref ? [1, 2, 3, 4, 5, 6, 7, 8] : [1] }}
         php-versions: [ '8.1' ]
         server-versions: [ 'master' ]
 
@@ -145,8 +146,8 @@ jobs:
       - name: Cypress run
         uses: cypress-io/github-action@v4
         with:
-          record: true
-          parallel: true
+          record: '${{ !!github.head_ref }}' # only on pull requests
+          parallel: '${{ !!github.head_ref }}' # only on pull requests
           wait-on: '${{ env.CYPRESS_baseUrl }}'
           working-directory: 'apps/${{ env.APP_NAME }}'
           config: defaultCommandTimeout=10000,video=false