Modify release workflow to have tag/release version as required input (…

…#1861)

.github/workflows/build-balena-disk-image.yaml

@@ -1,5 +1,16 @@
 name: Build Balena Disk Images
-on: workflow_dispatch
+on:
+  workflow_dispatch:
+    inputs:
+      tag:
+        description: 'Tag to be used for the release'
+        required: true
+        type: string
+      commit:
+        description: 'Commit or branch name'
+        required: false
+        type: string
+        default: 'master'
 
 jobs:
   balena-build-images:
@@ -92,3 +103,5 @@ jobs:
           allowUpdates: true
           prerelease: true
           artifacts: "*raspberry*.zip,*raspberry*.sha256,*raspberry*.json"
+          tag: ${{ inputs.tag }}
+          commit: ${{ inputs.commit }}