fix(maintenance): backup job fails every Sunday — tar archives its own output

[Copilot]

The weekly backup job (cron: '0 1 * * 0') always exits 1 because tar writes the archive into . (the source directory it is reading), triggering tar: .: file changed as we read it. The --exclude='*.tar.gz' guard is ineffective — the file already exists in the directory tree before tar can exclude it.

Fix

Write the archive to /tmp first, then move it into the workspace after tar completes:

- tar -czf "$ARCHIVE_NAME" \
-   --exclude='.git' \
-   --exclude='node_modules' \
-   --exclude='dist' \
-   --exclude='*.tar.gz' \
-   .
+ tar -czf "/tmp/$ARCHIVE_NAME" \
+   --exclude='.git' \
+   --exclude='node_modules' \
+   --exclude='dist' \
+   .
+ mv "/tmp/$ARCHIVE_NAME" "./$ARCHIVE_NAME"

The subsequent softprops/action-gh-release step is unchanged — it still picks up the archive by filename from the working directory.

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[Copilot]

Pull request overview

Fixes the weekly maintenance backup workflow failure caused by tar writing its output archive into the same directory tree it is archiving (triggering file changed as we read it), by generating the archive outside the source directory and then moving it into place for the release step.

Changes:

• Generate the backup archive in /tmp instead of the repository workspace to prevent self-archiving.
• Move the completed archive back into the workspace so the existing GitHub Release upload step continues to work unchanged.

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