Alter 3 files

Add .gitlab-ci.yml
Add Dockerfile
Add README.md

.gitlab-ci.yml

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+workflow:
+  rules:
+    - if: '$CI_COMMIT_TAG'
+
+stages:
+  - build
+
+default:
+  image: docker
+  services:
+    - docker:dind
+
+buildAndPush:
+  stage: build
+  before_script:
+    - "echo $CI_REGISTRY_PASSWORD | docker login $CI_REGISTRY --username $CI_REGISTRY_USER --password-stdin"
+    - "docker info"
+  script:
+    - "docker build . --file Dockerfile --tag ${CI_REGISTRY_IMAGE}:latest --tag ${CI_REGISTRY_IMAGE}:${CI_COMMIT_TAG#'v'}" # that weird thing #'v' thing strips a prefix of v
+    - "docker push --all-tags $CI_REGISTRY_IMAGE"

Dockerfile

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+FROM golang:1.23 AS builder
+
+RUN mkdir /build
+WORKDIR /build
+
+RUN git clone --branch=release-2.5 https://github.com/arp242/goatcounter.git .
+RUN go build -ldflags="-X zgo.at/goatcounter/v2.Version=$(git log -n1 --format='%h_%cI')" ./cmd/goatcounter
+
+FROM debian
+
+RUN mkdir -p /usr/bin
+COPY --from=builder /build/goatcounter /usr/bin
+
+RUN mkdir -p /run/goatcounter
+WORKDIR /run/goatcounter
+
+ENTRYPOINT ["goatcounter"]

README.md

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+# docker-goatcounter
+
+This is a very simple Docker wrapper around [Goatcounter](https://github.com/arp242/goatcounter), for ease of deployment.
+
+It must be configured exactly as normal through the command line (there are no environment variables). By default, the working directory within the container is `/run/goatcounter`.
+
+A good example of how to use this image would be:
+
+```
+docker run \
+  -p 127.0.0.1:8080:8080 \
+  -v $(pwd):/run/goatcounter \
+  registry.git.tdpain.net serve -listen :8080 -db 'sqlite+goatcounter.sqlite3.db' -tls proxy
+```