[FSSDK-11956] manual workflow update

Author: junaed-optimizely

.github/workflows/csharp_release.yml

@@ -3,18 +3,28 @@
 on:
   release:
     types: [ published ] # Trigger on published pre-releases and releases
-  workflow_dispatch: 
+  workflow_dispatch:
+    inputs:
+      tag:
+        description: 'Tag to build (e.g., v4.2.0)'
+        required: true
+        type: string 
 
 jobs:
   variables:
     name: Set Variables
     runs-on: ubuntu-latest
     env:
-      TAG: ${{ github.event.release.tag_name }}
+      TAG: ${{ github.event.release.tag_name || inputs.tag }}
     steps:
       - name: Extract semantic version from tag
         id: set_version
         run: |
+          if [ -z "${TAG}" ]; then
+            echo "Error: No release tag available. Please provide a tag when manually triggering the workflow."
+            exit 1
+          fi
+          echo "Processing tag: ${TAG}"
           # Remove the "v" prefix if it exists and extract the semantic version number
           SEMANTIC_VERSION=$(echo "${TAG}" | grep -Po "(?<=^|[^0-9])([0-9]+\.[0-9]+\.[0-9]+(\.[0-9]+)?(-[a-zA-Z]+[0-9]*)?)")
           SEMANTIC_VERSION=${SEMANTIC_VERSION#"v"}