Allow the use of flags in scripts/create-latest-svc.sh in a backwards compatible way (#1220)

* Use flags in svc creation script

* Refactor regex and add comments

* Fix indentation and typo in user matching

* Consistency use flags in automation scripts

* Update documentation to reflect new usage

* Make example more readable

* Remove test echos from script

* Remove test echo

* Format scripts and remove test script

* Remove tar

* Use getopts and single letter flags

* Update docs to show flag usage

* Update usage of create svc

* Revert svc to not use flags

* Revert delete script

* Update docs

* Readd deleted comments

docs/automate.md

@@ -26,6 +26,23 @@ Run as a one-liner. NOTE: replace with yourorg/yourrepo (repo level) or just you
 curl -s https://raw.githubusercontent.com/actions/runner/main/scripts/create-latest-svc.sh | bash -s yourorg/yourrepo
 ```
 
+You can call the script with additional arguments:
+```bash
+#   Usage:
+#       export RUNNER_CFG_PAT=<yourPAT>
+#       ./create-latest-svc -s scope -g [ghe_domain] -n [name] -u [user] -l [labels]
+#       -s          required  scope: repo (:owner/:repo) or org (:organization)
+#       -g          optional  ghe_hostname: the fully qualified domain name of your GitHub Enterprise Server deployment
+#       -n          optional  name of the runner, defaults to hostname
+#       -u          optional  user svc will run as, defaults to current
+#       -l          optional  list of labels (split by comma) applied on the runner"
+```
+
+Use `--` to pass any number of optional named parameters:
+
+```
+curl -s https://raw.githubusercontent.com/actions/runner/main/scripts/create-latest-svc.sh | bash -s -- -s myorg/myrepo -n myname -l label1,label2
+```
 ### Why can't I use a container?
 
 The runner is installed as a service using `systemd` and `systemctl`. Docker does not support `systemd` for service configuration on a container.