fix: show workflow info even if on.push is not defined (#1329) (#1335)

* fix: show workflow info even if on.push is not defined (#1329)

To fix listing of workflows in such cases list/graph filtering was split with planning.

Now act supports one of the following list (-l)/graph (-g) cases:
* show all jobs of loaded workflows: act -l
* show specific job JOBNAME: act -l -j JOBNAME
* show jobs of loaded workflows in which event EVENTNAME is set up: act -l EVENTNAME
* show jobs of loaded workflows in which first defined workflow event is set up: act -l --detect-event

For planning it supports:
* running specific job JOBNAME with triggered event determined from:
** CLI argument: act -j JOBNAME EVENTNAME
** first defined in loaded workflows event: act -j  JOBNAME --detect-event
** only defined in loaded workflows event: act -j JOBNAME
** push event by default: act -j JOBNAME

*  running jobs of loaded workflows in which event is set up, event is determined from:
** CLI argument: act EVENTNAME
** first defined in loaded workflows event: act --detect-event
** only defined in loaded workflows event: act
** push event by default: act

Except #1329 this PR fixes #1332, #1318

* Update docs/help

README.md

@@ -128,13 +128,17 @@ Download the [latest release](https://github.com/nektos/act/releases/latest) and
 # Command structure:
 act [<event>] [options]
 If no event name passed, will default to "on: push"
+If actions handles only one event it will be used as default instead of "on: push"
 
-# List the actions for the default event:
+# List all actions for all events:
 act -l
 
 # List the actions for a specific event:
 act workflow_dispatch -l
 
+# List the actions for a specific job:
+act -j test -l
+
 # Run the default (`push`) event:
 act