feat: introduce github action

Author: woile

.cz.toml

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+[tool.commitizen]
+name = "cz_conventional_commits"
+version = "0.0.1"
+tag_format = "v$major"

.github/workflows/bumpversion.yaml

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+name: Bump version
+
+on:
+  push:
+    branches:
+      - master
+
+jobs:
+  bump_version:
+    runs-on: ubuntu-latest
+    name: 'Bump version and create changelog with commitizen'
+    steps:
+    - name: Check out
+      uses: actions/checkout@v2
+    - name: Create bump and changelog
+      uses: Woile/commitizen-action@master
+      with:
+        dry_run: false
+    - name: Push changes back to master
+      uses: ad-m/github-push-action@master
+      with:
+        github_token: ${{ secrets.GITHUB_TOKEN }}

Dockerfile

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+FROM python:3.8
+COPY entrypoint.sh /entrypoint.sh
+ENTRYPOINT ["/entrypoint.sh"]

README.md

@@ -1,2 +1,49 @@
 # commitizen-action
+
 Commitizen github action to bump and create changelog
+
+## Usage
+
+1. In your local repo remember to create a `.cz.toml` file (run `cz init` to create it)
+2. Create a `.github/workflows/bumpversion.yaml` with the Sample Workflow
+
+## Sample Workflow
+
+```yaml
+name: Bump version
+
+on:
+  push:
+    branches:
+      - master
+
+jobs:
+  bump_version:
+    runs-on: ubuntu-latest
+    name: 'Bump version and create changelog with commitizen'
+    steps:
+    - name: Check out
+      uses: actions/checkout@v2
+    - name: Create bump and changelog
+      uses: Woile/commitizen-action@master
+      with:
+        dry_run: false
+    - name: Push changes back to master
+      uses: ad-m/github-push-action@master
+      with:
+        github_token: ${{ secrets.GITHUB_TOKEN }}
+
+```
+
+## Variables
+
+| Name        | Description                                   | Default |
+| ----------- | --------------------------------------------- | ------- |
+| `dry_run`   | Run without creating commit, output to stdout | false   |
+| `changelog` | Create changelog when bumping the version     | true    |
+
+## Contributing
+
+Whenever we want to release a new version, we have to mark it as breaking change.
+The `.cz.toml` configuration is using `$major` to format the tag, this means that
+it's the only kind of release allowed, so, mark as breaking change.

action.yml

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+name: 'Bump and changelog using commitizen'
+description: 'Create a commit bumping the version of your project and creating a changelog file'
+runs:
+  using: 'docker'
+  image: 'Dockerfile'
+branding:
+  icon: 'git-commit'
+  color: 'purple'
+inputs:
+  dry_run:
+    description: 'Run without creating commit, output to stdout'
+    default: "false"
+    required: false
+  changelog:
+    description: 'Create changelog when bumping the version'
+    default: "true"
+    required: false

entrypoint.sh

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+#!/bin/bash
+
+: "${INPUT_DRY_RUN:=false}"
+# : "${INPUT_CHANGELOG:=true}" ignroed for now, let's check that it works
+
+set -e
+
+echo "Repository: $GITHUB_REPOSITORY"
+echo "Actor: $GITHUB_ACTOR"
+
+echo "Installing requirements..."
+
+if [[ -f "requirements.txt" ]]; then
+    # Ensure commitizen + reqs may have custom commitizen plugins
+    pip install -r requirements.txt commitizen
+else
+    pip install commitizen
+fi
+
+echo "Runnung cz..."
+if ! $INPUT_DRY_RUN; then
+    cz bump --changelog
+else
+    cz bump --changelog --dry-run
+fi
+
+echo "Done."