chore(project): add action files

Dockerfile

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+FROM orhunp/git-cliff:latest
+
+LABEL maintainer="orhun <orhunparmaksiz@gmail.com>"
+LABEL repository="https://github.com/orhun/git-cliff-action"
+LABEL homepage="https://github.com/orhun/git-cliff"
+
+LABEL com.github.actions.name="Changelog Generator"
+LABEL com.github.actions.description="Generate changelog based on your Git history"
+LABEL com.github.actions.icon="triangle"
+LABEL com.github.actions.color="orange"
+
+COPY README.md /
+COPY LICENSE /
+
+COPY entrypoint.sh /entrypoint.sh
+
+ENTRYPOINT ["/entrypoint.sh"]

README.md

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+# git-cliff changelog generator action
+
+This action generates a changelog based on your Git history using [git-cliff](https://github.com/orhun/git-cliff), on the fly!
+
+## Usage
+
+### Inputs
+
+* `args`: Arguments to pass to git-cliff. Default `"-v"`
+
+### Outputs
+
+* `changelog`: The generated changelog.
+
+### Examples
+
+```
+- name: Changelog Generator
+  uses: orhun/git-cliff-action@v1
+  with:
+    args: --verbose
+```
+
+## Credits
+
+This action is based on [lycheeverse/lychee-action](https://github.com/lycheeverse/lychee-action) and uses [git-cliff](https://github.com/orhun/git-cliff).
+
+## License
+
+GNU General Public License ([v3.0](https://www.gnu.org/licenses/gpl.txt))
+
+## Copyright
+
+Copyright © 2021, [Orhun Parmaksız](mailto:orhunparmaksiz@gmail.com)

action.yml

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+name: "git-cliff: Changelog Generator"
+description: "Generate changelog based on your Git history"
+inputs:
+  args:
+    description: "git-cliff arguments"
+    required: false
+    default: "-v"
+outputs:
+  changelog:
+    description: 'generated changelog'
+runs:
+  using: "docker"
+  image: "Dockerfile"
+  args:
+    - ${{ inputs.args }}
+branding:
+  icon: "triangle"
+  color: "orange"

entrypoint.sh

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+#!/bin/bash -l
+set -uxo pipefail
+
+CHANGELOG_OUT=${CHANGELOG_OUT:="git-cliff/CHANGELOG.md"}
+
+# Create the output directory
+mkdir -p "$(dirname $CHANGELOG_OUT)"
+
+# Execute git-cliff
+git-cliff "$@" > "$CHANGELOG_OUT"
+exit_code=$?
+changelog=$(cat "$CHANGELOG_OUT")
+
+# Output to console
+echo "$changelog"
+
+# Set output
+echo "::set-output name=changelog::$changelog"
+
+# Pass exit code to the next step
+echo ::set-output name=exit_code::$exit_code