chore: extended commit message also for GitHub Actions

Author: JohannesHoppe

README.md

@@ -211,9 +211,7 @@ Learn more about ["personal access tokens" here](https://help.github.com/article
 - Example: `ng deploy --message="What could possibly go wrong?"`
 
 The commit message **must be wrapped in quotes** if there are any spaces in the text.  
-Some handy additional text is always added,
-if the environment variable `TRAVIS` exists (for Travis CI) or
-if the environment variable `CIRCLECI` exists (for Circle CI).
+Some additional text is always added to the message, if the command runs on Travis CI, Circle CI or GitHub Actions.
 
 #### --branch <a name="branch"></a>
 

src/engine/engine.ts

@@ -108,6 +108,16 @@ export async function prepareOptions(
       process.env.CIRCLE_BUILD_URL;
   }
 
+  if (process.env.GITHUB_ACTIONS) {
+    options.message +=
+      '\n\n' +
+      'Triggered by commit: https://github.com/' +
+      process.env.GITHUB_REPOSITORY +
+      '/' +
+      '/commit/' +
+      process.env.GITHUB_SHA;
+  }
+
   // NEW in 0.6.2: always discover remote URL (if not set)
   // this allows us to inject tokens from environment even if `--repo` is not set manually
   if (!options.repo) {