test: Do not leak step env in composite (#1585)

* test: Do not leak step env in composite

To prevent merging regressions.

* Update runner_test.go

pkg/runner/runner_test.go

@@ -203,6 +203,7 @@ func TestRunEvent(t *testing.T) {
 		// {"testdata", "issue-228", "push", "", platforms, }, // TODO [igni]: Remove this once everything passes
 		{"../model/testdata", "container-volumes", "push", "", platforms, secrets},
 		{workdir, "path-handling", "push", "", platforms, secrets},
+		{workdir, "do-not-leak-step-env-in-composite", "push", "", platforms, secrets},
 	}
 
 	for _, table := range tables {
@@ -295,12 +296,14 @@ func TestRunEventHostEnvironment(t *testing.T) {
 		}...)
 	} else {
 		platforms := map[string]string{
-			"self-hosted": "-self-hosted",
+			"self-hosted":   "-self-hosted",
+			"ubuntu-latest": "-self-hosted",
 		}
 
 		tables = append(tables, []TestJobFileInfo{
 			{workdir, "nix-prepend-path", "push", "", platforms, secrets},
 			{workdir, "inputs-via-env-context", "push", "", platforms, secrets},
+			{workdir, "do-not-leak-step-env-in-composite", "push", "", platforms, secrets},
 		}...)
 	}
 

pkg/runner/testdata/do-not-leak-step-env-in-composite/push.yml

@@ -0,0 +1,17 @@
+on: push
+jobs:
+  _:
+    runs-on: ubuntu-latest
+    steps:
+    - run: |
+        runs:
+          using: composite
+          steps:
+          - run: exit 1
+            if: env.LEAK_ENV != 'val'
+      shell: cp {0} action.yml
+    - uses: ./
+      env:
+        LEAK_ENV: val
+    - run: exit 1
+      if: env.LEAK_ENV == 'val'