chore(release): switch to SCP-only upload, remove rsync dependency

.gitea/workflows/release.yaml

@@ -114,7 +114,7 @@ jobs:
           $SUDO apt-get update
           # sshpass from apt, fdroidserver via pip to get a newer androguard that
           # can parse modern Flutter/AGP APKs (apt ships fdroidserver 2.2.1 which crashes)
-          $SUDO apt-get install -y sshpass rsync python3-pip
+          $SUDO apt-get install -y sshpass python3-pip
           pip3 install --break-system-packages --upgrade fdroidserver
 
       - name: Initialize or fetch F-Droid Repository
@@ -157,24 +157,12 @@ jobs:
         run: |
           set -euo pipefail
           REMOTE_REPO_DIR="dev/fdroid/repo"
-          SSH_OPTS="-o StrictHostKeyChecking=no -o ConnectTimeout=20 -o ServerAliveInterval=30 -o ServerAliveCountMax=5"
+          SCP_OPTS="-o StrictHostKeyChecking=no -o ConnectTimeout=20"
 
-          # 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
+          # Use SCP/SFTP path only (some hosts deny SSH exec channels required by rsync/ssh).
+          if sshpass -p "$PASS" scp $SCP_OPTS -r fdroid/repo/. "$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/"
+          # Fallback for older SSH servers that require legacy SCP protocol.
+          sshpass -p "$PASS" scp -O $SCP_OPTS -r fdroid/repo/. "$USER@$HOST:$REMOTE_REPO_DIR/"