feat: create Dockerfile

Dockerfile

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+FROM ubuntu:22.04
+
+LABEL maintainer="LinuxGSM <[email protected]>"
+
+# Install SteamCMD
+RUN echo "**** Install SteamCMD ****" \
+&& echo steam steam/question select "I AGREE" | debconf-set-selections \
+&& echo steam steam/license note '' | debconf-set-selections \
+&& dpkg --add-architecture i386 \
+&& apt-get update -y \
+&& apt-get install -y --no-install-recommends libsdl2-2.0-0:i386 locales steamcmd \
+&& ln -s /usr/games/steamcmd /usr/bin/steamcmd
+
+# Add unicode support
+RUN locale-gen en_US.UTF-8
+ENV LANG 'en_US.UTF-8'
+ENV LANGUAGE 'en_US:en'
+
+# Update SteamCMD
+RUN steamcmd +quit

workflows/docker-publish.yml

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+name: ci
+
+on:
+  push:
+    branches:
+      - 'main'
+  schedule:
+    - cron:  '0 0 * * *'
+
+jobs:
+  docker:
+    runs-on: ubuntu-latest
+    steps:
+      -
+        name: Checkout
+        uses: actions/checkout@v3
+      -
+        name: Set up QEMU
+        uses: docker/setup-qemu-action@v2
+      -
+        name: Set up Docker Buildx
+        uses: docker/[email protected]
+      -
+        name: Login to DockerHub
+        uses: docker/[email protected]
+        with:
+          username: ${{ secrets.DOCKER_HUB_USERNAME }}
+          password: ${{ secrets.DOCKER_HUB_ACCESS_TOKEN }}
+      -
+        name: Login to GitHub Container Registry
+        uses: docker/[email protected]
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      -
+        name: Build and push
+        uses: docker/[email protected]
+        with:
+          context: .
+          platforms: linux/amd64
+          push: true
+          tags: |
+            gameservermanagers/steamcmd:latest
+            gameservermanagers/steamcmd:ubuntu-22
+            ghcr.io/gameservermanagers/steamcmd:latest
+            ghcr.io/gameservermanagers/steamcmd:ubuntu-22