[CI] let's run params-env workflow also on push

Let's run the params-env workflow that checks values in params.env
and commit.env files also on push event and also on dispatch_workflow.

Author: jstourac

.github/workflows/params-env.yaml

@@ -1,11 +1,13 @@
 ---
 name: Validation of image references (image SHAs) in params.env and runtime images
 on:  # yamllint disable-line rule:truthy
+  push:
   pull_request:
     paths:
       - 'manifests/base/commit.env'
       - 'manifests/base/params.env'
       - 'ci/check-params-env.sh'
+  workflow_dispatch:
 
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   contents: read