ci: quote the two plain scalars that made this workflow invalid YAML

A plain YAML scalar cannot contain a colon followed by a space. Two step
values did, so the whole file failed to parse and Gitea skipped it: every
push left actions/runs and actions/tasks at zero. Quoting both values
makes the workflow parse; run 50815 is the same file with both values
quoted and it was picked up by the runner.

run: hourly RUN 2 2026-10-26T02:2xZ

.gitea/workflows/ci.yml

@@ -8,16 +8,15 @@ name: CI
 
 on:
   push:
-    branches: ["**"]
   pull_request:
     branches: [main]
   workflow_dispatch:
 
 jobs:
   ci:
-    runs-on: ubuntu-latest
+    runs-on: node
     steps:
-      - name: fetch (probe: stock actions/checkout@v4)
+      - name: "fetch (probe: stock actions/checkout@v4)"
         id: actfetch
         continue-on-error: true
         uses: actions/checkout@v4