Avoid warning on workflow_call triggers

Typically, we warn when there is no `push` trigger in the
workflow file that triggered this run. However, when this
action is triggered by a `workflow_call` event, we assume
there is a custom process for triggering the action and we
don't want to warn in this case.

CHANGELOG.md

@@ -7,6 +7,7 @@ Note that the only difference between `v2` and `v3` of the CodeQL Action is the
 ## [UNRELEASED]
 
 - Update default CodeQL bundle version to 2.17.2. [#2270](https://github.com/github/codeql-action/pull/2270)
+- Avoid printing out a warning for a missing `on.push` trigger when the CodeQL Action is triggered via a `workflow_call` event. [#2274](https://github.com/github/codeql-action/pull/2274)
 
 ## 3.25.3 - 25 Apr 2024
 
@@ -30,7 +31,7 @@ No user facing changes.
 
   - The `setup-python-dependencies` input to the `init` Action
   - The `CODEQL_ACTION_DISABLE_PYTHON_DEPENDENCY_INSTALLATION` environment variable
-  
+
   We recommend removing any references to these from your workflows. For more information, see the release notes for CodeQL Action v3.23.0 and v2.23.0.
 - Automatically overwrite an existing database if found on the filesystem. [#2229](https://github.com/github/codeql-action/pull/2229)
 - Bump the minimum CodeQL bundle version to 2.12.6. [#2232](https://github.com/github/codeql-action/pull/2232)