feat: add action

Dockerfile

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+# Use latest alpine image as base
+FROM alpine:latest
+
+# Copy needed stuff into container
+COPY LICENSE README.md /
+COPY entrypoint.sh /entrypoint.sh
+
+# Install some packages
+RUN apk add jq bash git go
+RUN apk add --no-cache --upgrade grep
+
+# Start action
+ENTRYPOINT ["/entrypoint.sh"]

action.yml

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+name: "PTerm Release"
+description: "Creates a new release if the PTerm version has changed in a commit."
+author: "MarvinJWendt"
+branding:
+  icon: award
+  color: orange
+runs:
+  using: "docker"
+  image: "Dockerfile"
+  args:
+    - ${{ inputs.myInput }}

entrypoint.sh

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+#!/bin/bash
+
+set -e
+
+REPO_FULLNAME=$(jq -r ".repository.full_name" "$GITHUB_EVENT_PATH")
+
+echo "## Initializing git repo..."
+git init
+echo "### Adding git remote..."
+git remote add origin https://x-access-token:$ACCESS_TOKEN@github.com/$REPO_FULLNAME.git
+echo "### Getting branch"
+BRANCH=${GITHUB_REF#*refs/heads/}
+
+if [[ $BRANCH == refs/tags* ]]; then
+  echo "## The push was a tag, aborting!"
+  exit
+fi
+
+echo "### git fetch $BRANCH ..."
+git fetch origin $BRANCH
+echo "### Branch: $BRANCH (ref: $GITHUB_REF )"
+git checkout $BRANCH
+
+echo "## Login into git..."
+git config --global user.email "[email protected]"
+git config --global user.name "MarvinJWendt"
+
+echo "## Ignore workflow files (we may not touch them)"
+git update-index --assume-unchanged .github/workflows/*
+
+# Start release
+
+git fetch --tags
+
+echo "## Detecting current version of dops"
+OLD_VERSION=$(git describe --tags $(git rev-list --tags --max-count=1))
+echo "## $OLD_VERSION"
+
+NEW_VERSION=$(cat pterm.go | grep "<---VERSION--->" | grep -oP "v\d*\.\d*\.\d*")
+
+echo "## Version in commit detected: $NEW_VERSION!"
+
+if [ "$OLD_VERSION" = "$NEW_VERSION" ]; then
+  echo "## Version did not change. Aborting!"
+else
+  echo "## Version change detected!"
+
+  git tag "$NEW_VERSION"
+
+  echo "## Staging changes..."
+  git add .
+  echo "## Commiting files..."
+  git commit -m "ci: release new version" || true
+  echo "## Pushing to $BRANCH"
+  git push -u origin $BRANCH --tags
+fi