feat: update the workflow dispatch []

Author: jatinlodhi2002

.github/workflows/sparrow-api-selfhost-publish.yml

@@ -1,20 +1,24 @@
 name: Self-host Docker Image
 on:
-  push:
-    branches: [ release-v2 ]
+
   workflow_dispatch:
+    inputs:
+      image_version:
+        description: "Docker image version (e.g. 1.2.3)"
+        required: true
+        type: string
 
 permissions:
   contents: read
 
-env:
-  DOCKER_IMAGE_VERSION: ${{ vars.SELF_HOST_DOCKER_IMAGE_VERSION }}  
-
 jobs:
   build:
     runs-on: ubuntu-latest
     environment: self-host
 
+    env:
+      DOCKER_IMAGE_VERSION: ${{ inputs.image_version }}
+
     steps:
       - name: Checkout
         uses: actions/checkout@v4