Add Dockerfile and modify gitlab CI to build the docker

.dockerignore

@@ -0,0 +1,25 @@
+**/.dockerignore
+**/.env
+**/.git
+**/.gitignore
+**/.project
+**/.settings
+**/.toolstarget
+**/.vs
+**/.vscode
+**/.idea
+**/*.*proj.user
+**/*.dbmdl
+**/*.jfm
+**/azds.yaml
+**/bin
+**/charts
+**/docker-compose*
+**/Dockerfile*
+**/node_modules
+**/npm-debug.log
+**/obj
+**/secrets.dev.yaml
+**/values.dev.yaml
+LICENSE
+README.md

.gitlab-ci.yml

@@ -1,21 +1,36 @@
-stages:
-  - build
+# To contribute improvements to CI/CD templates, please follow the Development guide at:
+# https://docs.gitlab.com/ee/development/cicd/templates.html
+# This specific template is located at:
+# https://gitlab.com/gitlab-org/gitlab/-/blob/master/lib/gitlab/ci/templates/Docker.gitlab-ci.yml
 
-variables:
-  DOTNET_CLI_TELEMETRY_OPTOUT: "1"
-  DOTNET_SKIP_FIRST_TIME_EXPERIENCE: "1"
+# Build a Docker image with CI/CD and push to the GitLab registry.
+# Docker-in-Docker documentation: https://docs.gitlab.com/ee/ci/docker/using_docker_build.html
+#
+# This template uses one generic job with conditional builds
+# for the default branch and all other (MR) branches.
 
-before_script:
-  - apt-get update && apt-get install -y tar
-
-build:
+docker-build:
+  # Use the official docker image.
+  image: docker:cli
   stage: build
-  image: mcr.microsoft.com/dotnet/sdk:9.0-bookworm-slim
+  services:
+    - docker:dind
+  variables:
+    DOCKER_IMAGE_NAME: $CI_REGISTRY_IMAGE:$CI_COMMIT_REF_SLUG
+  before_script:
+    - docker login -u "$CI_REGISTRY_USER" -p "$CI_REGISTRY_PASSWORD" $CI_REGISTRY
+  # All branches are tagged with $DOCKER_IMAGE_NAME (defaults to commit ref slug)
+  # Default branch is also tagged with `latest`
   script:
-    - dotnet nuget add source https://pkgs.dev.azure.com/tgbots/Telegram.Bot/_packaging/release/nuget/v3/index.json -n Telegram.Bot
-    - dotnet restore --no-cache
-    - dotnet publish -c Release -r linux-x64 --self-contained true /p:PublishSingleFile=true /p:PublishTrimmed=false /p:EnableCompressionInSingleFile=true
-    - tar -czvf publish.tar.gz -C bin/Release/net9.0/linux-x64/publish/ .
-  artifacts:
-    paths:
-      - publish.tar.gz
+    - docker build --pull -t "$DOCKER_IMAGE_NAME" .
+    - docker push "$DOCKER_IMAGE_NAME"
+    - |
+      if [[ "$CI_COMMIT_BRANCH" == "$CI_DEFAULT_BRANCH" ]]; then
+        docker tag "$DOCKER_IMAGE_NAME" "$CI_REGISTRY_IMAGE:latest"
+        docker push "$CI_REGISTRY_IMAGE:latest"
+      fi
+  # Run this job in a branch where a Dockerfile exists
+  rules:
+    - if: $CI_COMMIT_BRANCH
+      exists:
+        - Dockerfile

Dockerfile

@@ -0,0 +1,21 @@
+FROM mcr.microsoft.com/dotnet/aspnet:9.0-bookworm-slim-amd64 AS base
+USER $APP_UID
+WORKDIR /app
+
+FROM mcr.microsoft.com/dotnet/sdk:9.0-bookworm-slim-amd64 AS build
+ARG BUILD_CONFIGURATION=Release
+WORKDIR /src
+COPY ["mstdnCats.csproj", "./"]
+RUN dotnet restore "mstdnCats.csproj"
+COPY . .
+WORKDIR "/src/"
+RUN dotnet build "mstdnCats.csproj" -c $BUILD_CONFIGURATION -o /app/build
+
+FROM build AS publish
+ARG BUILD_CONFIGURATION=Release
+RUN dotnet publish "mstdnCats.csproj" -c $BUILD_CONFIGURATION -o /app/publish /p:UseAppHost=false
+
+FROM base AS final
+WORKDIR /app
+COPY --from=publish /app/publish .
+ENTRYPOINT ["dotnet", "mstdnCats.dll"]

mstdnCats.csproj

@@ -6,6 +6,7 @@
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>
     <JsonSerializerIsReflectionEnabledByDefault>true</JsonSerializerIsReflectionEnabledByDefault>
+    <DockerDefaultTargetOS>Linux</DockerDefaultTargetOS>
   </PropertyGroup>
 
   <ItemGroup>