chore(release): improve upload script with retries, directory check, and fallback to scp

.gitea/workflows/release.yaml

@@ -155,5 +155,26 @@ jobs:
           USER: ${{ secrets.HETZNER_USER }}
           PASS: ${{ secrets.HETZNER_PASS }}
         run: |
-          # Use rsync to efficiently upload only the changed files (the new APK and updated index files)
-          sshpass -p "$PASS" rsync -avz -e "ssh -o StrictHostKeyChecking=no" fdroid/repo/ $USER@$HOST:dev/fdroid/repo/
+          set -euo pipefail
+          REMOTE_REPO_DIR="dev/fdroid/repo"
+          SSH_OPTS="-o StrictHostKeyChecking=no -o ConnectTimeout=20 -o ServerAliveInterval=30 -o ServerAliveCountMax=5"
+
+          # Ensure target directory exists before upload.
+          sshpass -p "$PASS" ssh $SSH_OPTS "$USER@$HOST" "mkdir -p '$REMOTE_REPO_DIR'"
+
+          if sshpass -p "$PASS" ssh $SSH_OPTS "$USER@$HOST" "command -v rsync >/dev/null 2>&1"; then
+            ATTEMPT=1
+            until [ "$ATTEMPT" -gt 3 ]; do
+              echo "Rsync upload attempt $ATTEMPT/3"
+              if sshpass -p "$PASS" rsync -avz --timeout=60 -e "ssh $SSH_OPTS" fdroid/repo/ "$USER@$HOST:$REMOTE_REPO_DIR/"; then
+                exit 0
+              fi
+              sleep $((ATTEMPT * 5))
+              ATTEMPT=$((ATTEMPT + 1))
+            done
+            echo "Rsync failed after retries, falling back to scp"
+          else
+            echo "Remote rsync not found, using scp fallback"
+          fi
+
+          sshpass -p "$PASS" scp $SSH_OPTS -r fdroid/repo/. "$USER@$HOST:$REMOTE_REPO_DIR/"