feat: docker image

.github/workflows/docker.yml

@@ -0,0 +1,55 @@
+# See https://docs.github.com/en/packages/managing-github-packages-using-github-actions-workflows/publishing-and-installing-a-package-with-github-actions
+
+name: Publish docker image
+
+on:
+  push:
+    branches: [ "main" ]
+    tags: [ "v*" ]
+  pull_request:
+
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: ${{ github.repository }}
+
+jobs:
+  build-and-push-image:
+    runs-on: ubuntu-latest
+
+    permissions:
+      contents: read
+      packages: write
+      attestations: write
+      id-token: write
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Log in to the Container registry
+        uses: docker/login-action@v3
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract metadata (tags, labels) for Docker
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+          tags: |
+            type=ref,event=branch
+            type=ref,event=pr
+            type=semver,pattern={{version}}
+            type=semver,pattern={{major}}.{{minor}}
+            type=sha
+
+      - name: Build and push Docker image
+        id: push
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}

Dockerfile

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+# syntax=docker/dockerfile:1.7-labs
+
+# https://hub.docker.com/_/microsoft-dotnet
+FROM mcr.microsoft.com/dotnet/sdk:9.0 AS build
+WORKDIR /source
+
+RUN apt-get update \
+    && apt-get install -y --no-install-recommends \
+       clang zlib1g-dev libcurl4-openssl-dev
+
+# copy csproj and restore as distinct layers
+COPY --parents **/*.csproj .
+COPY *.sln .
+RUN dotnet restore
+
+# copy everything else and build app
+COPY . .
+RUN dotnet publish -c Release -o /app --no-restore
+
+# final stage/image
+FROM mcr.microsoft.com/dotnet/runtime-deps:9.0
+
+RUN apt-get update \
+     && apt-get install -y --no-install-recommends curl
+
+WORKDIR /app
+COPY --from=build /app ./
+ENTRYPOINT ["./LgkProductions.Discord.Activity"]