fix: jobparser: do not crash on invalid workflow_{dispatch,call} (#193)

An invalid workflow_{dispatch,call} key with a type that is not a map may attempt to use a nil map. It happens randomly as the order of the key maps is not guaranteed. Without this fix, the tests will fail 100% of the time with:

`go test -count=500 -run=TestParseRawOn/on:___workflow_ -v ./pkg/jobparser/`

Regression from https://code.forgejo.org/forgejo/act/pulls/45

Reviewed-on: https://code.forgejo.org/forgejo/act/pulls/193
Reviewed-by: Michael Kriese <michael.kriese@gmx.de>
Co-authored-by: Earl Warren <contact@earl-warren.org>
Co-committed-by: Earl Warren <contact@earl-warren.org>

act/jobparser/model.go

@@ -263,11 +263,13 @@ func ParseRawOn(rawOn *yaml.Node) ([]*Event, error) {
 						if isInvalidOnType(k, act) {
 							return nil, fmt.Errorf("unknown on type: %#v", v)
 						}
-						acts = nil
 					default:
 						return nil, fmt.Errorf("unknown on type: %#v", branches)
 					}
 				}
+				if k == "workflow_dispatch" || k == "workflow_call" {
+					acts = nil
+				}
 				res = append(res, &Event{
 					Name: k,
 					acts: acts,

act/jobparser/model_test.go

@@ -190,7 +190,14 @@ func TestParseRawOn(t *testing.T) {
 			},
 		},
 		{
-			input: "on:\n  workflow_dispatch:\n    inputs:\n      test:\n        type: string",
+			input: `
+on:
+  workflow_dispatch:
+    inputs:
+      test:
+        type: string
+    silently: ignore
+`,
 			result: []*Event{
 				{
 					Name: "workflow_dispatch",
@@ -198,7 +205,17 @@ func TestParseRawOn(t *testing.T) {
 			},
 		},
 		{
-			input: "on:\n  workflow_call:\n    inputs:\n      test:\n        type: string\n    outputs:\n      output:\n        value: something",
+			input: `
+on:
+  workflow_call:
+    inputs:
+      test:
+        type: string
+    outputs:
+      output:
+        value: something
+    silently: ignore
+`,
 			result: []*Event{
 				{
 					Name: "workflow_call",