fix(docker): Update base image from Alpine 3.20 to 3.21 to address security vulnerabilities

Author: thc1006

deploy/docker/cn-dms/Dockerfile

@@ -1,7 +1,7 @@
 # CN DMS Multi-stage Dockerfile (2025 Best Practices)
 # Stage 1: Build
-# Using Alpine 3.20 (stable) to fix CVE-2025-46394 and CVE-2024-58251
-FROM golang:1.24.7-alpine3.20 AS builder
+# Using Alpine 3.21 (stable) to fix CVE-2025-46394 and CVE-2024-58251
+FROM golang:1.24.7-alpine3.21 AS builder
 
 # Security and metadata labels
 LABEL maintainer="O-RAN MANO Team"

deploy/docker/o2-client/Dockerfile

@@ -1,7 +1,7 @@
 # O2 Client Multi-stage Dockerfile (2025 Best Practices)
 # Stage 1: Build
-# Using Alpine 3.20 (stable) to fix CVE-2025-46394 and CVE-2024-58251
-FROM golang:1.24.7-alpine3.20 AS builder
+# Using Alpine 3.21 (stable) to fix CVE-2025-46394 and CVE-2024-58251
+FROM golang:1.24.7-alpine3.21 AS builder
 
 # Security and metadata labels
 LABEL maintainer="O-RAN MANO Team"

deploy/docker/orchestrator/Dockerfile

@@ -4,8 +4,8 @@
 # Fixed for GitHub Actions CI/CD which builds from root
 
 # Stage 1: Build
-# Using Alpine 3.20 (stable) to fix CVE-2025-46394 and CVE-2024-58251
-FROM golang:1.24.7-alpine3.20 AS builder
+# Using Alpine 3.21 (stable) to fix CVE-2025-46394 and CVE-2024-58251
+FROM golang:1.24.7-alpine3.21 AS builder
 
 # Security and build metadata
 LABEL org.opencontainers.image.title="O-RAN Orchestrator"

deploy/docker/ran-dms/Dockerfile

@@ -1,7 +1,7 @@
 # RAN DMS Multi-stage Dockerfile (2025 Best Practices)
 # Stage 1: Build
-# Using Alpine 3.20 (stable) to fix CVE-2025-46394 and CVE-2024-58251
-FROM golang:1.24.7-alpine3.20 AS builder
+# Using Alpine 3.21 (stable) to fix CVE-2025-46394 and CVE-2024-58251
+FROM golang:1.24.7-alpine3.21 AS builder
 
 # Security and metadata labels
 LABEL maintainer="O-RAN MANO Team"

deploy/docker/tn-agent/Dockerfile

@@ -1,7 +1,7 @@
 # TN Agent Multi-stage Dockerfile (2025 Best Practices)
 # Stage 1: Build
-# Using Alpine 3.20 (stable) to fix CVE-2025-46394 and CVE-2024-58251
-FROM golang:1.24.7-alpine3.20 AS builder
+# Using Alpine 3.21 (stable) to fix CVE-2025-46394 and CVE-2024-58251
+FROM golang:1.24.7-alpine3.21 AS builder
 
 # Security and metadata labels
 LABEL maintainer="O-RAN MANO Team"

deploy/docker/tn-manager/Dockerfile

@@ -1,7 +1,7 @@
 # TN Manager Multi-stage Dockerfile (2025 Best Practices)
 # Stage 1: Build
-# Using Alpine 3.20 (stable) to fix CVE-2025-46394 and CVE-2024-58251
-FROM golang:1.24.7-alpine3.20 AS builder
+# Using Alpine 3.21 (stable) to fix CVE-2025-46394 and CVE-2024-58251
+FROM golang:1.24.7-alpine3.21 AS builder
 
 # Security and metadata labels
 LABEL maintainer="O-RAN MANO Team"