adds ci-cd and Docker container

.gitlab-ci.yml

@@ -0,0 +1,27 @@
+
+docker-build:
+  # Use the official docker image.
+  image: docker:latest
+  stage: build
+  services:
+    - docker:dind
+  before_script:
+    - docker login -u "$CI_REGISTRY_USER" -p "$CI_REGISTRY_PASSWORD" $CI_REGISTRY
+  # Default branch leaves tag empty (= latest tag)
+  # All other branches are tagged with the escaped branch name (commit ref slug)
+  script:
+    - |
+      if [[ "$CI_COMMIT_BRANCH" == "$CI_DEFAULT_BRANCH" ]]; then
+        tag=""
+        echo "Running on default branch '$CI_DEFAULT_BRANCH': tag = 'latest'"
+      else
+        tag=":$CI_COMMIT_REF_SLUG"
+        echo "Running on branch '$CI_COMMIT_BRANCH': tag = $tag"
+      fi
+    - docker build --pull -t "$CI_REGISTRY_IMAGE${tag}" .
+    - docker push "$CI_REGISTRY_IMAGE${tag}"
+  # Run this job in a branch where a Dockerfile exists
+  rules:
+    - if: $CI_COMMIT_BRANCH
+      exists:
+        - Dockerfile

Dockerfile

@@ -0,0 +1,20 @@
+FROM golang:latest as builder
+
+ARG GO_CMD=funbot
+ENV CGO_ENABLED=0 \
+    GOARCH=amd64 \
+    GOOS=linux
+
+WORKDIR /app
+
+ADD . /app/
+
+RUN go build -ldflags "-s -w -extldflags '-static'" -o /main ./cmd/${GO_CMD}/
+
+FROM scratch
+COPY --chown=65534:0 --from=builder /main /
+
+USER 65534
+WORKDIR /
+
+CMD ["/main"]