Add Docker build configuration and CI/CD pipeline for container deployment

.gitlab-ci.yml

@@ -0,0 +1,36 @@
+# 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
+
+# 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.
+
+docker-build:
+  # Use the official docker image.
+  image: docker:cli
+  stage: build
+  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 $DOCKER_IMAGE_NAME (defaults to commit ref slug)
+  # Default branch is also tagged with `latest`
+  script:
+    - docker build --pull -t "$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 +1,31 @@
+# https://docs.docker.com/guides/golang/build-images/
+
+# syntax=docker/dockerfile:1
+
+# Build the application from source
+FROM golang:1.24.3 AS build-stage
+
+WORKDIR /app
+
+COPY go.mod go.sum ./
+RUN go mod download
+
+COPY cmd/ ./
+COPY internal ./
+
+RUN CGO_ENABLED=0 GOOS=linux go build -o /CatsOfMastodonGo
+
+# Deploy the application binary into a lean image
+FROM gcr.io/distroless/static-debian12 AS build-release-stage
+
+WORKDIR /
+
+COPY --from=build-stage /CatsOfMastodonGo /CatsOfMastodonGo
+COPY --from=build-stage /app/internal/web/templates /internal/web/templates
+
+
+EXPOSE 8080
+
+USER nonroot:nonroot
+
+ENTRYPOINT ["/CatsOfMastodonGo"]