Add Dockerfile and CI for Docker

.dockerignore

@@ -0,0 +1,9 @@
+# directories
+**/bin/
+**/obj/
+**/out/
+
+# files
+Dockerfile*
+**/*.trx
+**/*.md

.github/workflows/build-docker.yml

@@ -0,0 +1,75 @@
+name: Docker CI
+
+on:
+  workflow_dispatch:
+  push:
+    branches:
+      - 'master'
+    tags:
+      - 'v*'
+    paths-ignore:
+      - '.github/*'
+      - '.github/*_TEMPLATE/**'
+      - '*.md'
+  pull_request:
+    branches:
+      - 'master'
+    paths-ignore:
+      - '.github/*'
+      - '.github/*_TEMPLATE/**'
+      - '*.md'
+
+jobs:
+  build:
+    name: Docker image
+    runs-on: ubuntu-latest
+    env:
+      DOCKER_USERNAME: "dumbasPL"
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v2
+        with:
+          platforms: amd64,arm64,arm
+      
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v2
+
+      - name: Login to Docker Hub
+        if: github.event_name != 'pull_request'
+        uses: docker/login-action@v2
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+      
+      - name: Login to GitHub Container Registry
+        if: github.event_name != 'pull_request'
+        uses: docker/login-action@v2
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Docker meta
+        id: meta
+        uses: docker/metadata-action@v4
+        with:
+          images: |
+            ${{ env.DOCKER_USERNAME }}/DepotDownloader
+            ghcr.io/${{ env.DOCKER_USERNAME }}/DepotDownloader
+          tags: |
+            type=ref,event=branch
+            type=semver,pattern={{version}}
+            type=semver,pattern={{major}}.{{minor}}
+            type=semver,pattern={{major}}
+            type=sha
+        
+      - name: Build and push
+        uses: docker/build-push-action@v4
+        with:
+          context: .
+          push: ${{ github.event_name != 'pull_request' }}
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+

Dockerfile

@@ -0,0 +1,21 @@
+FROM mcr.microsoft.com/dotnet/sdk:6.0-alpine AS build
+
+ENV DOTNET_CLI_TELEMETRY_OPTOUT=true
+
+WORKDIR /DepotDownloader
+
+COPY ./ ./
+
+RUN dotnet restore
+
+RUN dotnet publish -c Release -o out
+
+FROM mcr.microsoft.com/dotnet/runtime:6.0-alpine
+
+ENV DOTNET_CLI_TELEMETRY_OPTOUT=true
+
+WORKDIR /DepotDownloader
+
+COPY --from=build /DepotDownloader/out .
+
+ENTRYPOINT ["dotnet", "DepotDownloader.dll"]