Add support for workflow_dispatch trigger

Closes #112

.github/workflows/workflow.yml

@@ -1,5 +1,14 @@
 name: "Workflow"
-on: ["push"]
+on:
+  push:
+  workflow_dispatch:
+    inputs:
+      BASE_MANUAL:
+        description: "The base SHA"
+        required: true
+      HEAD_MANUAL:
+        description: "The head SHA"
+        required: false
 jobs:
   build:
     runs-on: "ubuntu-latest"
@@ -8,5 +17,10 @@ jobs:
       - name: "TODO to Issue"
         uses: "alstr/todo-to-issue-action@master"
         id: "todo"
+        env:
+          BASE_MANUAL:
+            ${{ inputs.BASE_MANUAL }}
+          HEAD_MANUAL:
+            ${{ inputs.HEAD_MANUAL }}
         with:
           PROJECTS_SECRET: ${{ secrets.PROJECTS_SECRET }}