feat: add release message with docker pull command

Reviewed-on: #4

Jenkinsfile

@@ -25,6 +25,5 @@ standardMakePipeline([
     // Use credentials to push images to registry and pubish gitea release
     'credentials': [
         usernamePassword(credentialsId: 'kipp-credentials', usernameVariable: 'MKT_GITEA_RELEASE_USERNAME', passwordVariable: 'MKT_GITEA_RELEASE_PASSWORD')
-    ],
-    'releaseBranches': ['jenkins-release']
+    ]
 ])

Makefile

@@ -9,6 +9,15 @@ MKT_GITEA_RELEASE_ORG ?= Cadoles
 MKT_GITEA_RELEASE_PROJECT ?= hydra-werther
 MKT_GITEA_RELEASE_VERSION ?= $(MKT_PROJECT_VERSION)
 
+define MKT_GITEA_RELEASE_BODY
+## Docker usage
+
+```
+docker pull $(IMAGE_NAME):$(MKT_PROJECT_VERSION)
+```
+endef
+export MKT_GITEA_RELEASE_BODY
+
 build: build-bin build-image
 
 build-bin: clean generate