ci: add support for acceptance test for cassettes (#2885)

Author: remyleone

.github/workflows/nightly.yml

@@ -86,6 +86,8 @@ jobs:
         env:
           SLACK_WEBHOOK_NIGHTLY: ${{ secrets.SLACK_WEBHOOK_NIGHTLY }}
           FAILED_PRODUCT: ${{ matrix.products }}
+      - name: Run acceptance test for cassettes
+        run: go test -v github.com/scaleway/terraform-provider-scaleway/v2/internal/acctest -run TestAccCassettes_Validator
 
   # sweeper needs to run after nightly completed
   # no matter what are the results of the jobs