Fix CI/CD: remove duplicate apk commands and fix YAML structure

- Consolidated package installation into single apk command
- Fixed YAML syntax by removing duplicate netcat installation
- Properly structured commands section to avoid parsing errors
- This should resolve the 'unmarshal !!map into string' error

.drone.yml

@@ -197,7 +197,7 @@ steps:
         from_secret: staging_key
     commands:
       - echo "Checking staging environment configuration..."
-      - apk add --no-cache openssh-client git curl
+      - apk add --no-cache openssh-client git curl netcat-openbsd
       - |
         if [ -z "$STAGING_HOST" ] || [ -z "$STAGING_USER" ]; then
           echo "⚠️ Staging credentials not configured"
@@ -211,7 +211,6 @@ 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 $STAGING_HOST 22 2>/dev/null; then
           echo "❌ Cannot connect to staging server on port 22"
@@ -411,14 +410,13 @@ steps:
         from_secret: production_user
     commands:
       - echo "Checking production server connectivity..."
-      - apk add --no-cache openssh-client curl
+      - apk add --no-cache openssh-client curl netcat-openbsd
       - |
         if [ -z "$PROD_HOST" ] || [ -z "$PROD_USER" ]; then
           echo "❌ Production server credentials not configured"
           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"