Add more steps context support (#887)

* feat: add more steps context support

- Add step outcome
- Remove step success in favour of conclusion

* feat: add conclusion and outcome steps context tests

Add corresponding tests and extend pkg/runner/expression.go vmSteps() to
handle steps context conclusion and outcome iota as strings.

Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

act/runner/expression_test.go

@@ -49,22 +49,25 @@ func TestEvaluate(t *testing.T) {
 		},
 		StepResults: map[string]*stepResult{
 			"idwithnothing": {
+				Conclusion: stepStatusSuccess,
+				Outcome:    stepStatusFailure,
 				Outputs: map[string]string{
 					"foowithnothing": "barwithnothing",
 				},
-				Success: true,
 			},
 			"id-with-hyphens": {
+				Conclusion: stepStatusSuccess,
+				Outcome:    stepStatusFailure,
 				Outputs: map[string]string{
 					"foo-with-hyphens": "bar-with-hyphens",
 				},
-				Success: true,
 			},
 			"id_with_underscores": {
+				Conclusion: stepStatusSuccess,
+				Outcome:    stepStatusFailure,
 				Outputs: map[string]string{
 					"foo_with_underscores": "bar_with_underscores",
 				},
-				Success: true,
 			},
 		},
 	}
@@ -107,8 +110,14 @@ func TestEvaluate(t *testing.T) {
 		{"github.run_id", "1", ""},
 		{"github.run_number", "1", ""},
 		{"job.status", "success", ""},
+		{"steps.idwithnothing.conclusion", "success", ""},
+		{"steps.idwithnothing.outcome", "failure", ""},
 		{"steps.idwithnothing.outputs.foowithnothing", "barwithnothing", ""},
+		{"steps.id-with-hyphens.conclusion", "success", ""},
+		{"steps.id-with-hyphens.outcome", "failure", ""},
 		{"steps.id-with-hyphens.outputs.foo-with-hyphens", "bar-with-hyphens", ""},
+		{"steps.id_with_underscores.conclusion", "success", ""},
+		{"steps.id_with_underscores.outcome", "failure", ""},
 		{"steps.id_with_underscores.outputs.foo_with_underscores", "bar_with_underscores", ""},
 		{"runner.os", "Linux", ""},
 		{"matrix.os", "Linux", ""},