Fix environment variables and move envs.txt/event.json to fixed location (#667)

* fix: environment variables sourcing from `/etc/environment`

* fix: move `envs.txt` & `event.json` to `/tmp/`

Since #635 `envs.txt` is not copying properly when running `act` in WSL2
Moving it to fixed location resolves that.

pkg/runner/step_context.go

@@ -113,8 +113,7 @@ func (sc *StepContext) mergeEnv() map[string]string {
 	}
 
 	if (rc.ExtraPath != nil) && (len(rc.ExtraPath) > 0) {
-		s := append(rc.ExtraPath, `/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin`)
-		env["PATH"] = strings.Join(s, `:`)
+		env["PATH"] = strings.Join(rc.ExtraPath, `:`)
 	}
 
 	sc.Env = rc.withGithubEnv(env)
@@ -131,7 +130,7 @@ func (sc *StepContext) setupEnv(ctx context.Context) (ExpressionEvaluator, error
 	rc := sc.RunContext
 	sc.Env = sc.mergeEnv()
 	if sc.Env != nil {
-		err := rc.JobContainer.UpdateFromGithubEnv(&sc.Env)(ctx)
+		err := rc.JobContainer.UpdateFromEnv(sc.Env["GITHUB_ENV"], &sc.Env)(ctx)
 		if err != nil {
 			return nil, err
 		}