feat: add Dockerfile and README

Author: woile

Dockerfile

@@ -0,0 +1,10 @@
+FROM python:3-alpine
+
+WORKDIR /app
+
+# Add dependencies
+RUN apk add --update -t --no-cache git curl alpine-sdk
+
+RUN ["pip", "install", "commitizen>=2,<3"]
+
+CMD [ "cz version" ]

README.md

@@ -1 +1,45 @@
-# commitizen-docker-image
+# commitizen-docker-image
+
+> commitizen now avaialble in docker 💪
+
+## Docker images
+
+We publish only major versions starting with `v2`.
+
+| Tag                            | Description                            |
+| ------------------------------ | -------------------------------------- |
+| `commitizen/commitizen:latest` | Latest major version, at the moment v2 |
+| `commitizen/commitizen:2`      | Points to latest v2                    |
+
+## Usage
+
+## As Script
+
+```bash
+docker run --rm -v $(pwd):/usr/src/project commitizen/commitizen:latest /bin/sh -c 'cz bump --changelog'
+```
+
+## Inside container
+
+Open a terminal inside docker with `cz` available and with the current directory mounted.
+This way we can run any `cz` command.
+
+```bash
+docker run --rm -it -v $(pwd):/usr/src/project commitizen/commitizen:latest
+```
+
+## Contributing
+
+### Build and push image
+
+```bash
+./scripts/build
+./scripts/push
+```
+
+### Test locally
+
+```bash
+./scripts/build
+./scripts/run 'cz ls'
+```

scripts/build

@@ -0,0 +1,3 @@
+#!/bin/sh -e
+set -x
+docker build -t registry.hub.docker.com/commitizen/commitizen:2 -t registry.hub.docker.com/commitizen/commitizen:latest .

scripts/push

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+#!/bin/sh -e
+docker push registry.hub.docker.com/commitizen/commitizen

scripts/run

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+#!/bin/sh -ex
+docker run --rm --name commitizen commitizen:2 /bin/sh -c "$@"