ci: Run on ci-staging branch and manual dispatch

Both help with debugging and troubleshooting.  Also allow setting
RUST_LOG for manual runs.

.forgejo/workflows/taskbot.yml

@@ -2,9 +2,15 @@ on:
   schedule:
     - cron: '0 8,18 * * *'
   # For testing:
-  # push:
-  #   branches:
-  #     - 'poc'
+  push:
+    branches:
+      - 'ci-staging'
+  workflow_dispatch:
+    inputs:
+      RUST_LOG:
+        description: 'RUST_LOG environment variable for log filter'
+        type: string
+        required: false
 
 jobs:
   build:
@@ -12,4 +18,4 @@ jobs:
     steps:
       - uses: https://code.forgejo.org/actions/checkout@v4
       - name: Run TaskBot
-        run: nix-shell .forgejo/script/taskbot.nix --run "fafo-taskbot"
+        run: RUST_LOG="${{ inputs.RUST_LOG }}" nix-shell .forgejo/script/taskbot.nix --run "fafo-taskbot"