chore: add CI/CD tooling and project configuration

- Add commit-message-generator skill for standardized commit messages
 - Add buildspec.yml for CodeBuild Docker image build process
 - Add build-artifact.sh script for creating deployment packages
 - Add .gitignore to exclude zip files from version control

scripts/build-artifact.sh

@@ -0,0 +1,39 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+ROOT_DIR="$(cd "$(dirname "$0")/.." && pwd)"
+ARTIFACT_DIR="${ROOT_DIR}/artifacts"
+ZIP_PATH="${ARTIFACT_DIR}/blog-lambda-source.zip"
+
+echo "Building artifact for blog-lambda pipeline..."
+echo "Root directory: ${ROOT_DIR}"
+
+mkdir -p "${ARTIFACT_DIR}"
+
+# Create temporary directory for staging files
+tmpdir="$(mktemp -d)"
+trap 'rm -rf "${tmpdir}"' EXIT
+
+# Copy necessary files for CodeBuild
+echo "Copying source files..."
+cp -r "${ROOT_DIR}/cmd"                  "${tmpdir}/cmd"
+cp -r "${ROOT_DIR}/docker"               "${tmpdir}/docker"
+cp -r "${ROOT_DIR}/ci"                   "${tmpdir}/ci"
+cp    "${ROOT_DIR}/go.mod"               "${tmpdir}/go.mod"
+cp    "${ROOT_DIR}/go.sum"               "${tmpdir}/go.sum"
+
+# Create the ZIP archive
+echo "Creating ZIP archive..."
+(
+  cd "${tmpdir}"
+  zip -r "${ZIP_PATH}" . -x "*.git*" "*.DS_Store"
+)
+
+# Display artifact info
+echo ""
+echo "✅ Artifact created successfully!"
+echo "   Path: ${ZIP_PATH}"
+echo "   Size: $(du -h "${ZIP_PATH}" | cut -f1)"
+echo ""
+echo "To upload to S3:"
+echo "  aws s3 cp ${ZIP_PATH} s3://\${BUCKET_NAME}/blog-lambda-source.zip"