Fix slack actions webhooks format (#2071)

Author: maciektr

.github/workflows/check.yml

@@ -28,9 +28,9 @@ jobs:
     steps:
       - name: Notifying about failed tests!
         uses: slackapi/[email protected]
-        env:
-          SLACK_WEBHOOK_URL: ${{ secrets.SLACK_SCHEDULED_TESTS_FAILURE_WEBHOOK_URL }}
         with:
+          webhook: ${{ secrets.SLACK_SCHEDULED_TESTS_FAILURE_WEBHOOK_URL }}
+          webhook-type: webhook-trigger
           payload: |
             {
               "url": "${{ github.server_url }}/${{ github.repository }}/actions/runs/${{ github.run_id }}"

.github/workflows/nightly.yml

@@ -185,9 +185,9 @@ jobs:
     steps:
       - name: Notifying about Nightly fail!
         uses: slackapi/[email protected]
-        env:
-          SLACK_WEBHOOK_URL: ${{ secrets.SLACK_NIGHTLY_FAILURE_WEBHOOK_URL }}
         with:
+          webhook: ${{ secrets.SLACK_NIGHTLY_FAILURE_WEBHOOK_URL }}
+          webhook-type: webhook-trigger
           payload: |
             {
               "url": "${{ github.server_url }}/${{ github.repository }}/actions/runs/${{ github.run_id }}"
@@ -202,9 +202,9 @@ jobs:
     steps:
       - name: Notifying about check fail!
         uses: slackapi/[email protected]
-        env:
-          SLACK_WEBHOOK_URL: ${{ secrets.SLACK_NIGHTLY_CHECK_FAILURE_WEBHOOK_URL }}
         with:
+          webhook: ${{ secrets.SLACK_NIGHTLY_CHECK_FAILURE_WEBHOOK_URL }}
+          webhook-type: webhook-trigger
           payload: |
             {
               "url": "${{ github.server_url }}/${{ github.repository }}/actions/runs/${{ github.run_id }}"