diff --git a/.gitea/workflows/package.yml b/.gitea/workflows/package.yml
index b86c643..472f8b2 100644
--- a/.gitea/workflows/package.yml
+++ b/.gitea/workflows/package.yml
@@ -7,7 +7,7 @@ on:
 
 jobs:
   docker-image:
-    runs-on: ubuntu
+    runs-on: "ubuntu:docker://gitea/runner-images:ubuntu-22.04"
     permissions:
       contents: read
     defaults:
@@ -121,7 +121,7 @@ jobs:
             -d "{\"image\":\"${IMAGE_REF}\",\"tag\":\"${IMAGE_TAG}\",\"repo\":\"${REPOSITORY_PATH}\"}"
 
   deploy-fallback-log:
-    runs-on: ubuntu
+    runs-on: "ubuntu:docker://gitea/runner-images:ubuntu-22.04"
     needs: docker-image
     if: failure()
     steps:
diff --git a/memery.md b/memery.md
index 310297d..1698838 100644
--- a/memery.md
+++ b/memery.md
@@ -6,5 +6,7 @@
 - **Why this matters for act_runner:** self-hosted Gitea runners can reuse working directories or start from repositories that already contain Git metadata, so checkout logic must be idempotent.
 - **Applied fix:** changed `.gitea/workflows/package.yml` to initialize Git only when needed, use `git remote set-url origin ...` when `origin` already exists, and force-clean the workspace after checking out `FETCH_HEAD`.
 - **Safety improvement for remote validation:** tags ending with `-test` now run the build verification path only. They skip registry login, image push, `latest` updates, and the deploy webhook so act_runner can be tested without deployment side effects.
+- **Root cause found on the real act_runner:** although the runner was registered with `ubuntu:docker://gitea/runner-images:ubuntu-22.04`, the workflow used `runs-on: ubuntu`, and the job log showed `Start image=ubuntu:latest`. That default image does not include the expected toolset, which explains the remote `git: not found` failure.
+- **Applied fix for label selection:** changed both jobs to `runs-on: "ubuntu:docker://gitea/runner-images:ubuntu-22.04"` so Gitea resolves the exact runner image instead of falling back to `ubuntu:latest`.
 - **Current local result:** `npm run lint`, `npm run test -- --runInBand`, `npm run build`, `docker build ...`, and `npm run build` inside `gitea/runner-images:ubuntu-22.04` all completed successfully after the workflow adjustment.
 - **Non-blocking note:** local Jest run reported a haste-map naming collision between `package.json` and `.next/standalone/package.json`; tests still passed, and this does not affect the current image-build workflow.