Add docker support and github CR package workflow

.dockerignore

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+# Version control
+.git
+.gitignore
+
+# Build artifacts
+dist/
+bin/
+claws
+claws-codegen
+*.exe
+*.test
+*.out
+
+# IDE / editor
+.idea/
+.vscode/
+*.swp
+*.swo
+*~
+
+# OS
+.DS_Store
+Thumbs.db
+
+# CI / config
+.github/
+CLAUDE.md
+AGENTS.md
+.claude/
+
+# Local env
+.env
+.env.local
+.gtrconfig
+
+# Docs & scripts
+docs/
+scripts/localstack-*
+node_modules/
+.lsmcp/
+
+# Docker
+Dockerfile
+.dockerignore

.github/workflows/docker.yml

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+name: Docker
+
+on:
+  push:
+    branches: [main]
+    tags: ['v*']
+  pull_request:
+    branches: [main]
+
+permissions:
+  contents: read
+  packages: write
+
+jobs:
+  docker:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v6
+
+      - uses: docker/setup-buildx-action@v3
+
+      - name: Log in to GHCR
+        if: github.event_name != 'pull_request'
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract metadata
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ghcr.io/${{ github.repository }}
+          tags: |
+            type=semver,pattern={{version}}
+            type=semver,pattern={{major}}.{{minor}}
+            type=sha,prefix=
+            type=raw,value=latest,enable={{is_default_branch}}
+
+      - name: Build and push
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          push: ${{ github.event_name != 'pull_request' }}
+          platforms: linux/amd64,linux/arm64
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          build-args: |
+            VERSION=${{ steps.meta.outputs.version }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max

Dockerfile

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+# syntax=docker/dockerfile:1
+
+# ---- Build stage ----
+FROM --platform=$BUILDPLATFORM golang:1.25-alpine AS build
+
+WORKDIR /src
+
+COPY go.mod go.sum ./
+RUN go mod download
+
+COPY . .
+
+ARG VERSION=dev
+ARG TARGETOS TARGETARCH
+
+RUN CGO_ENABLED=0 GOOS=${TARGETOS} GOARCH=${TARGETARCH} go build \
+    -ldflags="-s -w -X main.version=${VERSION}" \
+    -o /claws ./cmd/claws
+
+# ---- Runtime stage ----
+FROM alpine:3.21
+
+# CA certs for AWS API TLS, and tzdata for time zone support
+RUN apk add --no-cache ca-certificates tzdata
+
+COPY --from=build /claws /usr/local/bin/claws
+
+RUN adduser -D -h /home/claws claws
+USER claws
+WORKDIR /home/claws
+
+ENTRYPOINT ["claws"]