Add webhook show, return info and some fixes

* Added a webhook show command. This gives us info about the webhook and
    if it is installed.
  * Return webhook info when installing the webhook
  * Small typo fixes.

Signed-off-by: Gabriel Adrian Samfira <gsamfira@cloudbasesolutions.com>

runner/pool/common.go

@@ -0,0 +1,63 @@
+package pool
+
+import (
+	"net/url"
+	"strings"
+
+	runnerErrors "github.com/cloudbase/garm-provider-common/errors"
+	"github.com/cloudbase/garm/params"
+	"github.com/google/go-github/v53/github"
+	"github.com/pkg/errors"
+)
+
+func validateHookRequest(controllerID, baseURL string, allHooks []*github.Hook, req *github.Hook) error {
+	parsed, err := url.Parse(baseURL)
+	if err != nil {
+		return errors.Wrap(err, "parsing webhook url")
+	}
+
+	partialMatches := []string{}
+	for _, hook := range allHooks {
+		hookURL, ok := hook.Config["url"].(string)
+		if !ok {
+			continue
+		}
+		hookURL = strings.ToLower(hookURL)
+
+		if hook.Config["url"] == req.Config["url"] {
+			return runnerErrors.NewConflictError("hook already installed")
+		} else if strings.Contains(hookURL, controllerID) || strings.Contains(hookURL, parsed.Hostname()) {
+			partialMatches = append(partialMatches, hook.Config["url"].(string))
+		}
+	}
+
+	if len(partialMatches) > 0 {
+		return runnerErrors.NewConflictError("a webhook containing the controller ID or hostname of this contreoller is already installed on this repository")
+	}
+
+	return nil
+}
+
+func hookToParamsHookInfo(hook *github.Hook) params.HookInfo {
+	var hookURL string
+	url, ok := hook.Config["url"]
+	if ok {
+		hookURL = url.(string)
+	}
+
+	var insecureSSL bool
+	insecureSSLConfig, ok := hook.Config["insecure_ssl"]
+	if ok {
+		if insecureSSLConfig.(string) == "1" {
+			insecureSSL = true
+		}
+	}
+
+	return params.HookInfo{
+		ID:          *hook.ID,
+		URL:         hookURL,
+		Events:      hook.Events,
+		Active:      *hook.Active,
+		InsecureSSL: insecureSSL,
+	}
+}