Add With field to jobparser.Job (#37)

Partially Fixes [gitea/act_runner#91 comment](https://gitea.com/gitea/act_runner/issues/91#issuecomment-734544)

nektos/act has added `With` to support reusable workflows (see [code](68c72b9a51/pkg/model/workflow.go (L160)))

GitHub actions also support [`jobs.<job_id>.with`](https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#jobsjob_idwith)

Reviewed-on: https://gitea.com/gitea/act/pulls/37
Reviewed-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: Zettat123 <zettat123@gmail.com>
Co-committed-by: Zettat123 <zettat123@gmail.com>

pkg/jobparser/jobparser_test.go

@@ -32,6 +32,11 @@ func TestParse(t *testing.T) {
 			options: nil,
 			wantErr: false,
 		},
+		{
+			name:    "has_with",
+			options: nil,
+			wantErr: false,
+		},
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {