forgjo-actions: add manual trigger to pipeline

.forgejo/workflows/nightly-update.yaml

@@ -3,6 +3,7 @@ on:
   #   branches: [main]
   schedule:
     - cron: 0 */6 * * *
+  workflow_dispatch:
 jobs:
   update:
     runs-on: native
@@ -15,18 +16,18 @@ jobs:
           # It bypasses branch protection rules that block the default GITHUB_TOKEN.
           token: ${{ secrets.PUSH_TOKEN }}
       - name: Update flake
-        if: ${{ github.event_name == 'schedule' }}
+        if: ${{ github.event_name == 'schedule' || github.event_name == 'workflow_dispatch' }}
         run: |
           cd ${{ env.FORGEJO_WORKSPACE }}
           nix flake update
       - name: Commit new Flake.lock
-        if: ${{ github.event_name == 'schedule' }}
+        if: ${{ github.event_name == 'schedule' || github.event_name == 'workflow_dispatch' }}
         run: |
           git config --local user.email "forgejo-actions[bot]@christophhollizeck.dev"
           git config --local user.name "forgejo-actions[bot]"
           git commit -a -m "chore: update flake"
       - name: Push changes
-        if: ${{ github.event_name == 'schedule' }}
+        if: ${{ github.event_name == 'schedule' || github.event_name == 'workflow_dispatch' }}
         run: git push
 
       # - name: Build Loptland