Address code review feedback: pin Alpine version and add .dockerignore

Co-authored-by: parkcheolhong <111139476+parkcheolhong@users.noreply.github.com>

Author: Copilot

.dockerignore

@@ -0,0 +1,14 @@
+# Exclude version control
+.git
+.gitignore
+
+# Exclude GitHub workflows and configuration
+.github
+
+# Exclude build artifacts and dependencies
+node_modules
+dist
+
+# Exclude temporary files
+*.tmp
+*.log

Dockerfile

@@ -1,7 +1,7 @@
 # Minimal Dockerfile for desktop-tutorial repository
 # This allows the Anchore security scanning workflow to run successfully
 
-FROM alpine:latest
+FROM alpine:3.19
 
 # Add a label for documentation
 LABEL maintainer="desktop-tutorial"