Add alpine Dockerfile

Author: sue445

.dockerignore

@@ -0,0 +1,6 @@
+.bundle/
+.gem_rbs_collection/
+.git/
+.yardoc/
+doc/
+vendor/

README.md

@@ -131,6 +131,19 @@ Run `bundle exec rake build_all`.
 
 See `bundle exec rake -T` for more tasks.
 
+### Build in docker container
+e.g.
+
+```bash
+docker build --file=_dockerfiles/alpine.dockerfile -t go-gem-wrappper .
+# or
+docker build --file=_dockerfiles/alpine.dockerfile -t go-gem-wrappper --build-arg GO_VERSION=1.23 --build-arg RUBY_VERSION=3.4 .
+
+docker run --rm -it go-gem-wrappper sh
+```
+
+Run `bundle exec rake build_all` in container.
+
 ### See `godoc` in local
 ```bash
 go install golang.org/x/tools/cmd/godoc@latest

_dockerfiles/alpine.dockerfile

@@ -0,0 +1,31 @@
+ARG GO_VERSION=1.23
+ARG RUBY_VERSION=3.4
+ARG ALPINE_VERSION=3.21
+
+FROM golang:${GO_VERSION}-alpine${ALPINE_VERSION} AS golang
+
+FROM ruby:${RUBY_VERSION}-alpine${ALPINE_VERSION}
+
+RUN apk update && \
+    apk add --no-cache git alpine-sdk libffi-dev
+
+COPY --from=golang /usr/local/go /usr/local/go
+COPY --from=golang /go /go
+
+ENV PATH=/go/bin:/usr/local/go/bin:$PATH \
+    GOPATH=/go \
+    GOLANGCI_LINT_VERSION=v1.60.3
+
+RUN wget -O- -nv https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh | sh -s ${GOLANGCI_LINT_VERSION}
+
+WORKDIR /app
+
+COPY Gemfile Gemfile.lock ./
+COPY _gem/go_gem.gemspec _gem/
+COPY _gem/lib/go_gem/version.rb _gem/lib/go_gem/
+
+RUN bundle config --local path vendor/bundle/ && \
+    bundle config --local deployment true && \
+    bundle install --jobs 4
+
+COPY . .