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

.github/skills/commit-message-generator/SKILL.md

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+---
+name: commit-message-generator
+description: Generate appropriate commit messages based on Git diffs
+---
+
+## Prerequisites
+- This Skill retrieves Git diffs and suggests meaningful commit messages
+- Message format should follow Conventional Commits
+- Commit messages should be in English
+- **Never perform Git commit or Git push**
+
+## Steps
+1. Run `git status` to check modified files
+2. Retrieve diffs with `git diff` or `git diff --cached`
+3. Analyze the diff content and determine if changes should be split into multiple commits
+4. For each logical group of changes:
+   - List the target files
+   - Generate a message in English compliant with Conventional Commits
+   - Suggest the command: `git add <files> && git commit -m "<message>"`
+5. If changes are extensive and should be split, provide:
+   - Rationale for the split
+   - Multiple commit suggestions with their respective target files and messages
+
+## Commit Splitting Guidelines
+- Split commits when changes span multiple logical concerns (e.g., feature + refactoring)
+- Group related files that serve the same purpose
+- Keep each commit focused on a single, atomic change
+
+## Notes
+- **This Skill must never execute `git commit` or `git push`**
+- Only suggest commands; execution is entirely at user's discretion
+- Users must explicitly perform commits and pushes themselves

.gitignore

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+*.zip

ci/buildspec.yml

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+version: 0.2
+phases:
+  pre_build:
+    commands:
+      - echo Logging in to Amazon ECR...
+      - aws ecr get-login-password --region $AWS_DEFAULT_REGION | docker login --username AWS --password-stdin $ECR_REPOSITORY_URI
+      - IMAGE_TAG=$(date +%s)
+      - echo "Image tag will be ${IMAGE_TAG}"
+  build:
+    commands:
+      - echo Build started on `date`
+      - echo Building Docker image for ARM64/Lambda...
+      - docker build --platform linux/arm64 -f docker/Dockerfile -t $ECR_REPOSITORY_URI:$IMAGE_TAG -t $ECR_REPOSITORY_URI:latest .
+  post_build:
+    commands:
+      - echo Build completed on `date`
+      - echo Pushing Docker images...
+      - docker push $ECR_REPOSITORY_URI:$IMAGE_TAG
+      - docker push $ECR_REPOSITORY_URI:latest
+      - echo "Image pushed with tags ${IMAGE_TAG} and latest"

scripts/build-artifact.sh

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+#!/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"