Add [TA] JOJ preparation and testing process

%5BTA%5D-JOJ-preparation-and-testing-process.md

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+#  JOJ preparation and testing process
+
+## Preparation
+
+
+
+**Important.** Never release or make JOJ available before it has been fully tested.
+
+## Testing
+
+The first time JOJ is setup, make sure to run extensive tests in a separate test repository. When all tests are successful , create an orphan branch in `course-joj` with name `test-repoName`, where `repoName` corresponds to the name of the repository used by students. This new orphan branch must have the exact same structure as the repository used by students. For instance, if students have a `homework` repository, then call the branch `test-homework` and its content should have the exact same structure as the `homework` repository, e.g. one directory per homework with similar filenames, etc..
+
+
+
+
+
+## Known issues
+
+### Gitea actions and LFS
+
+Bug: https://github.com/actions/checkout/issues/1830#issuecomment-2314758792
+
+Solution: adjust the YAML workflow fot checkout LFS object separately.
+
+<details><summary>Sample YAML worklow file.</summary>
+```yaml
+name: Run JOJ3 on Push
+on: [push]
+
+jobs:
+  run:
+    runs-on: focs-ubuntu-latest-slim
+    container:
+      volumes:
+        - /home/tt/.config:/home/tt/.config
+        - /home/tt/.cache:/home/tt/.cache
+        - /home/tt/.ssh:/home/tt/.ssh
+    steps:
+      - name: Check out repository code
+        uses: actions/checkout@focs
+        with:
+          lfs: false
+          persist-credentials: 'true'
+      - name: Checkout lfs
+        run: |
+          git lfs install --local
+          AUTH=$(git config --local http.https://focs.ji.sjtu.edu.cn/.extraheader)
+          git config --local --unset http.https://focs.ji.sjtu.edu.cn/.extraheader
+          git config --local http.${{ gitea.server_url }}/${{ gitea.repository }}.git/info/lfs/objects/batch.extraheader "$AUTH"
+          git lfs pull
+      - name: run joj3
+        run: |
+          sudo -E -u tt joj3 -conf-root /home/tt/.config/joj
+```
+
+</details>
+
+### Memory sanitizer
+