add the github private key option

plugin.go

@@ -59,6 +59,16 @@ type (
 // Exec executes the plugin
 func (p Plugin) Exec() error {
 
+	// Install a Github SSH key
+	if len(os.Getenv("GITHUB_PRIVATE_SSH_KEY")) > 0 {
+		sshconfErr := installGithubSsh(os.Getenv("GITHUB_PRIVATE_SSH_KEY"))
+
+		if sshconfErr != nil {
+			return sshconfErr
+		}
+	}
+
+	// Install an AWS profile if env var is set
 	if len(os.Getenv("AWS_ACCESS_KEY_ID")) > 0 {
 		profileErr := installProfile(os.Getenv("AWS_PROFILE"), os.Getenv("AWS_ACCESS_KEY_ID"), os.Getenv("AWS_SECRET_ACCESS_KEY"))
 

terraform.go

@@ -17,6 +17,21 @@ type (
 	}
 )
 
+func installGithubSsh(githubSshPrivate string) error {
+	os.Mkdir(os.Getenv("HOME")+"/.aws", 0700)
+	myconf := []byte("Host github.com\n    StrictHostKeyChecking no\n    UserKnownHostsFile=/dev/null\n")
+	err := ioutil.WriteFile(os.Getenv("HOME")+"/.ssh/conf", myconf, 0644)
+	if err != nil {
+		return err
+	}
+	mykey := []byte(githubSshPrivate)
+	err2 := ioutil.WriteFile(os.Getenv("HOME")+"/.ssh/id_rsa", mykey, 0600)
+	if err2 != nil {
+		return err2
+	}
+	return nil
+}
+
 func installProfile(profileName string, profileKey string, profileSecret string) error {
 	os.Mkdir(os.Getenv("HOME")+"/.aws", 0700)
 	myconf := []byte("[" + profileName + "]\naws_access_key_id = " + profileKey + "\naws_secret_access_key = " + profileSecret + "\n")