feat: add docker container.

Dockerfile

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+FROM golang:1.11
+
+# Github labels
+LABEL "com.github.actions.name"="Action Telegram"
+LABEL "com.github.actions.description"="Sending a Telegram notification message"
+LABEL "com.github.actions.icon"="message-square"
+LABEL "com.github.actions.color"="blue"
+
+LABEL "repository"="https://github.com/Ilshidur/actions"
+LABEL "homepage"="https://github.com/appleboy/telegram-action"
+LABEL "maintainer"="Bo-Yi Wu <appleboy.tw@gmail.com>"
+LABEL "version"="0.0.1"
+
+ENV TELEGRAM_VERSION=1.4.0
+ENV OS_ARCH=linux-amd64
+
+RUN wget https://github.com/appleboy/drone-telegram/releases/download/${TELEGRAM_VERSION}/drone-telegram-${TELEGRAM_VERSION}-${OS_ARCH} -O /bin/drone-telegram
+RUN chmod +x /bin/drone-telegram
+
+ADD entrypoint.sh /entrypoint.sh
+RUN chmod +x /entrypoint.sh
+ENTRYPOINT ["/entrypoint.sh"]

entrypoint.sh

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+#!/bin/sh
+
+set -eu
+
+export TELEGRAM_MESSAGE=$?
+
+/bin/drone-telegram