Workflow improvement - add option for non-PR manual builds (#652)

@nerdCopter please add some documentation how to use (in the docs)

Author: nerdCopter

.github/workflows/manual-build.yml

@@ -0,0 +1,18 @@
+name: Manual Build
+run-name: Manual Build ${{ github.ref_name }} ${{ ((inputs.debug_build == true) && '(debug)') || '' }}
+
+on:
+  workflow_dispatch:
+    inputs:
+      debug_build:
+      description: 'Specifies if it is a debug build or a release build'
+        default: true
+        required: false
+        type: boolean
+
+jobs:
+  ci:
+    name: CI
+    uses: ./.github/workflows/ci.yml
+    with:
+      debug_build: ${{ inputs.debug_build }}