fix: CI rm binary before cp to avoid 'Text file busy'

On Linux, rm on a running binary works (process keeps its fd).
Then cp creates a new inode. Restart service after.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.gitea/workflows/build-iso.yml

@@ -19,9 +19,9 @@ jobs:
         run: |
           source $HOME/.cargo/env 2>/dev/null || true
           cargo build --release --manifest-path core/Cargo.toml
-          sudo systemctl stop archipelago 2>/dev/null || true
+          sudo rm -f /usr/local/bin/archipelago
           sudo cp core/target/release/archipelago /usr/local/bin/archipelago
-          sudo systemctl start archipelago 2>/dev/null || true
+          sudo systemctl restart archipelago 2>/dev/null || true
 
       - name: Build frontend
         run: |