[skip ci] Support prereleased and manual release dispatch

Allow the workflow to run for prereleased releases and manually via workflow_dispatch with version and channel inputs. Update the determine_channel job to use provided inputs when invoked manually, otherwise extract X.Y.Z from the release name and set the channel to "Preview" if the release name contains that substring, or "Stable" otherwise.

Author: Cryotechnic

.github/workflows/release-winget.yml

@@ -1,7 +1,20 @@
 name: Publish Stable & Preview builds to WinGet
 on:
   release:
-    types: [released]
+    types: [released, prereleased]
+  workflow_dispatch:
+    inputs:
+      version:
+        description: 'Version to publish (e.g. 1.2.3)'
+        required: true
+        type: string
+      channel:
+        description: 'Release channel'
+        required: true
+        type: choice
+        options:
+          - Stable
+          - Preview
 jobs:
   determine_channel:
     runs-on: ubuntu-latest
@@ -13,18 +26,23 @@ jobs:
         id: check
         # Find X.Y.Z version, then check for "Preview" after it for regex
         run: |
-          RELEASE_NAME="${{ github.event.release.name }}"
-          if [[ "$RELEASE_NAME" =~ (\d+\.\d+\.\d+) ]]; then
-            VERSION="${BASH_REMATCH[1]}"
+          if [[ "${{ github.event_name }}" == "workflow_dispatch" ]]; then
+            VERSION="${{ inputs.version }}"
+            CHANNEL="${{ inputs.channel }}"
           else
-            echo "Error: Could not find X.Y.Z version in release name."
-            exit 1
-          fi
+            RELEASE_NAME="${{ github.event.release.name }}"
+            if [[ "$RELEASE_NAME" =~ (\d+\.\d+\.\d+) ]]; then
+              VERSION="${BASH_REMATCH[1]}"
+            else
+              echo "Error: Could not find X.Y.Z version in release name."
+              exit 1
+            fi
 
-          if [[ "$RELEASE_NAME" == *"Preview"* ]]; then
-            CHANNEL="Preview"
-          else
-            CHANNEL="Stable"
+            if [[ "$RELEASE_NAME" == *"Preview"* ]]; then
+              CHANNEL="Preview"
+            else
+              CHANNEL="Stable"
+            fi
           fi
 
           echo "Detected Channel: $CHANNEL"