Use provided r10k command_path

Prior to this, the Config struct had a setting under the R10k struct
called CommandPath that could be set in the config file, but was
ignored as both places that would use it were hard coded to instead use
the string `r10k`. This resulted in the application looking in the path
for the r10k binary. A default is set in config.go also, but that seems
to have also been ignored.

This fixes #152

README.md

@@ -221,6 +221,12 @@ Type: bool
 Description: Run `puppet generate types` after updating an environment
 Default: `true`
 
+### `command_path`
+
+Type: `string`
+Description: Allow overriding the default path to r10k.
+Default: `/opt/puppetlabs/puppetserver/bin/r10k`
+
 ## Usage
 
 Webhook API provides following paths

api/environment.go

@@ -24,7 +24,7 @@ func (e EnvironmentController) DeployEnvironment(c *gin.Context) {
 	var branch string
 
 	// Set the base r10k command into a slice of strings
-	cmd := []string{"r10k", "deploy", "environment"}
+	cmd := []string{h.GetR10kCommand(), "deploy", "environment"}
 
 	// Get the configuration
 	conf := config.GetConfig()

api/module.go

@@ -24,7 +24,7 @@ func (m ModuleController) DeployModule(c *gin.Context) {
 	var h helpers.Helper
 
 	// Set the base r10k command into a string slice
-	cmd := []string{"r10k", "deploy", "module"}
+	cmd := []string{h.GetR10kCommand(), "deploy", "module"}
 
 	// Get the configuration
 	conf := config.GetConfig()

lib/helpers/r10k-command.go

@@ -0,0 +1,14 @@
+package helpers
+
+import "github.com/voxpupuli/webhook-go/config"
+
+const Command = "r10k"
+
+func (h *Helper) GetR10kCommand() string {
+	conf := config.GetConfig().R10k
+	commandPath := conf.CommandPath
+	if commandPath == "" {
+		return Command
+	}
+	return commandPath
+}