Fix CI/CD: YAML syntax errors and missing netcat dependency

- Fixed YAML formatting issues in staging deployment section
- Added explicit netcat-openbsd installation before connectivity tests
- Escaped DRONE_BRANCH variable in SSH commands to prevent YAML parsing errors
- Fixed indentation and structure to ensure proper YAML validation

.drone.yml

@@ -211,6 +211,7 @@ steps:
       - chmod 600 ~/.ssh/id_rsa
       - ssh-keyscan -H $STAGING_HOST >> ~/.ssh/known_hosts 2>/dev/null || true
       - echo "Testing staging server connectivity..."
+      - apk add --no-cache netcat-openbsd
       - |
         if ! nc -z $STAGING_HOST 22 2>/dev/null; then
           echo "❌ Cannot connect to staging server on port 22"
@@ -222,7 +223,7 @@ steps:
         ssh $STAGING_USER@$STAGING_HOST "cd /opt/smartsoltech-staging && 
           echo 'Fetching latest changes...' &&
           git fetch origin && 
-          git reset --hard origin/${DRONE_BRANCH} && 
+          git reset --hard origin/\${DRONE_BRANCH} && 
           echo 'Restarting services...' &&
           docker-compose down --timeout 30 && 
           docker-compose pull && 
@@ -417,6 +418,7 @@ steps:
           exit 1
         fi
       - echo "Testing SSH connectivity to $PROD_HOST..."
+      - apk add --no-cache netcat-openbsd
       - |
         if ! nc -z $PROD_HOST 22; then
           echo "❌ SSH port 22 is not accessible on $PROD_HOST"