Add a Dockerfile to build, test, and publish to NuGet. Add GitHub Actions workflows.

Author: dmytro-khmara

.dockerignore

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+# directories
+**/bin/
+**/obj/
+**/out/
+
+# files
+Dockerfile*
+**/*.md
+
+!README.md

.github/workflows/build.yml

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+on:
+  push:
+    branches:
+    - master
+  pull_request:
+    branches:
+    - master
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    timeout-minutes: 15
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v2
+    - name: Build
+      run: docker build --target build .
+    - name: Test
+      run: docker build --target test .      

.github/workflows/publish.yml

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+on:
+  release:
+    types: [released]
+jobs:
+  publish:
+    runs-on: ubuntu-latest
+    timeout-minutes: 15
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v2
+    - name: Set VERSION variable from tag
+      run: echo "VERSION=${GITHUB_REF/refs\/tags\/}" >> $GITHUB_ENV
+    - name: Build
+      run: docker build --target build .
+    - name: Test
+      run: docker build --target test .
+    - name: Pack & Publish
+      run: docker build --target pack-and-push --build-arg PackageVersion=${VERSION} --build-arg NuGetApiKey=${{secrets.NUGET_API_KEY}} .
+

Dockerfile

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+FROM mcr.microsoft.com/dotnet/sdk:6.0 AS build
+WORKDIR /source
+
+# copy csproj and restore as distinct layers
+COPY *.sln .
+COPY src/StrEnum.EntityFrameworkCore/StrEnum.EntityFrameworkCore.csproj ./src/StrEnum.EntityFrameworkCore/StrEnum.EntityFrameworkCore.csproj
+COPY test/StrEnum.EntityFrameworkCore.UnitTests/StrEnum.EntityFrameworkCore.UnitTests.csproj ./test/StrEnum.EntityFrameworkCore.UnitTests/StrEnum.EntityFrameworkCore.UnitTests.csproj
+RUN dotnet restore
+
+# copy everything else and build app
+COPY ./ ./
+WORKDIR /source
+RUN dotnet build -c release -o /out/package --no-restore
+
+FROM build as test
+RUN dotnet test
+
+FROM build as pack-and-push
+WORKDIR /source
+
+ARG PackageVersion
+ARG NuGetApiKey
+
+RUN dotnet pack ./src/StrEnum.EntityFrameworkCore/StrEnum.EntityFrameworkCore.csproj -o /out/package -c Release
+RUN dotnet nuget push /out/package/StrEnum.EntityFrameworkCore.$PackageVersion.nupkg -k $NuGetApiKey -s https://api.nuget.org/v3/index.json