add: Dockerfile.

Dockerfile

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+FROM golang:1.15.6-alpine3.12
+
+ARG USER_NAME='circleci'
+ARG USER_UID='1000'
+ARG USER_GID='1000'
+ARG USER_GROUP='app_users'
+
+ENV GOPATH /home/$USER_NAME
+ENV CGO_ENABLED 0
+ENV TERRAFORM_DOWNLOAD_URL 'https://releases.hashicorp.com/terraform/0.13.6/terraform_0.13.6_linux_amd64.zip'
+ENV TFLINT_DOWNLOAD_URL 'https://github.com/wata727/tflint/releases/download/v0.13.1/tflint_linux_amd64.zip'
+ENV TERRAGRUNT_DOWNLOAD_URL 'https://github.com/gruntwork-io/terragrunt/releases/download/v0.27.1/terragrunt_linux_amd64'
+ENV AWSCLI_DOWNLOAD_URL 'https://awscli.amazonaws.com/awscli-exe-linux-x86_64.zip'
+
+# VS Code Requirements: openssh, musl, libgcc, libstdc++
+RUN apk --no-progress --purge --no-cache upgrade \
+ && apk --no-progress --purge --no-cache add --upgrade \
+    curl \
+    git \
+    gnupg \
+    libgcc \
+    libstdc++ \
+    openssh \
+    tini \
+ && apk --no-progress --purge --no-cache upgrade \
+ && rm -vrf /var/cache/apk/* \
+ && curl --version \
+ && git --version
+
+# Install vanilla GLibC: https://github.com/sgerrand/alpine-pkg-glibc
+RUN curl -o /etc/apk/keys/sgerrand.rsa.pub https://alpine-pkgs.sgerrand.com/sgerrand.rsa.pub \
+ && curl -LO https://github.com/sgerrand/alpine-pkg-glibc/releases/download/2.32-r0/glibc-2.32-r0.apk \
+ && apk add glibc-2.32-r0.apk
+
+RUN echo 'Install AWS CLI 2' \
+ && curl -o /tmp/awscliv2.zip "${AWSCLI_DOWNLOAD_URL}" \
+ && unzip -q -d /tmp /tmp/awscliv2.zip \
+ && /tmp/aws/install
+
+# Add a non-root group and user, helpful if you dev on Linux.
+RUN addgroup --system --gid $USER_GID $USER_GROUP \
+ && adduser --system \
+    --disabled-password \
+    --ingroup $USER_GROUP \
+    --uid $USER_UID \
+    $USER_NAME
+
+USER $USER_NAME
+
+# Install Go helpful dev tools.
+RUN mkdir -p ~/bin \
+ && curl -L -o ~/bin/git-chglog https://github.com/git-chglog/git-chglog/releases/download/v0.10.0/git-chglog_linux_amd64 \
+ && chmod +x ~/bin/git-chglog
+
+# VSCode Requirements for pre-installing extensions
+RUN mkdir -p /home/$USER_NAME/.vscode-server \
+    /home/$USER_NAME/.vscode-server-insiders \
+    "${GOPATH}/src" \
+    "${GOPATH}/bin"
+
+RUN curl -fL -o /tmp/terraform.zip "${TERRAFORM_DOWNLOAD_URL}" \
+ && unzip -q -d "${GOPATH}/bin" /tmp/terraform.zip \
+ && rm -f /tmp/terraform.zip
+
+RUN curl -fL -o "${GOPATH}/bin/terragrunt" "${TERRAGRUNT_DOWNLOAD_URL}" \
+ && chmod +x "${GOPATH}/bin/terragrunt"
+
+ENV PATH "${PATH}:${GOPATH}/bin"
+
+ENTRYPOINT [ "tini", "--" ]
+
+CMD [ "tail", "-f", "/dev/null" ]