Prepare to build releases from branches

.github/workflows/release-eclipse-ls-extensions.yml

@@ -11,6 +11,11 @@ on:
         description: Last segments of an s3 path for p2 Repo for eclipse ls extensions
         required: true
         type: string
+      ref:
+        description: Git branch, tag, commit hash
+        required: false
+        default: 'main'
+        type: string
 
 jobs:
 
@@ -21,4 +26,5 @@ jobs:
       build_type: 'release'
       skip_tests: true
       sts4-language-servers-version: ${{ inputs.sts4-language-servers-version }}
+      ref: ${{ inputs.ref }}
     secrets: inherit