Update dependencies in github workflow

This commit sets a set of dependencies between workflows. The chain of
workflows is following:

Validation -> E2E tests -> deployment

Author: Allda

.github/workflows/deploy.yml

@@ -5,7 +5,6 @@ on:  # yamllint disable-line rule:truthy
   workflow_run:
     workflows:
       - E2E-CI
-      - validation
     branches:
       - main
     types:

.github/workflows/e2e.yml

@@ -2,9 +2,13 @@
 name: E2E-CI
 
 on:  # yamllint disable-line rule:truthy
-  push:
+  workflow_run:
+    workflows:
+      - validation
     branches:
       - main
+    types:
+      - completed
   workflow_dispatch:
 jobs: