[DO-550] bbl container create tags (#23)

Reviewed-on: https://git.avroid.tech/DevOps/jenkins-shared-lib/pulls/23
Co-authored-by: aleksandr.vodyanov <aleksandr.vodyanov@avroid.tech>
Co-committed-by: aleksandr.vodyanov <aleksandr.vodyanov@avroid.tech>

src/tech/avroid/scm/Git.groovy

@@ -112,11 +112,12 @@ class Git implements Serializable {
 
     /**
       * Method executes command "git push"
+      * @param String branch - ветка, коммит, тег, который пушится. По умолчанию пустая строка
       */
-    public push() {
+    public push(String branch = '') {
         script.sshagent([this.creds]) {
             script.sh """
-                git push
+                git push ${branch}
             """
         }
     }
@@ -135,7 +136,7 @@ class Git implements Serializable {
       * Method executes command "git log".
       * @param Map args:
       *     - int Count: count of commits
-      *        - String format: format of output (see git log --help) 
+      *     - String format: format of output (see git log --help) 
       */
     public String log(Map args = [:]) {
         Map defaultArgs = [
@@ -155,4 +156,29 @@ class Git implements Serializable {
 
         return this.script.sh(script: "git log -n $args.count $args.format", returnStdout: true).trim()
     }
+
+    /**
+      * Method executes command "git tag". 
+      * @param Map args:
+      * 	- String tagName: имя тега
+      *     - String pointsAt: просмотр тегов на определенном коммите
+      */
+    public String tag(Map args = [:]) {
+        Map defaultArgs = [
+            tagName: '',
+            pointsAt: '',
+        ]
+
+        defaultArgs.each { k, v ->
+            if (args[k] == null || args[k] == '' || args[k] == []) {
+                args[k] = v
+            }
+        }
+        
+        if (args.pointsAt != '') {
+            args.pointsAt = "--points-at ${args.pointsAt}"
+        }
+
+        return this.script.sh(script: "git tag $args.tagName $args.pointsAt", returnStdout: true).trim()
+    }
 }