Added basic action structure

CODE_OF_CONDUCT.md

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+# Code of Conduct
+
+Be excellent to each other.

Dockerfile

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+FROM node:lts-alpine3.9
+RUN apk update && apk upgrade && apk add --no-cache bash git openssh
+COPY entrypoint.sh /entrypoint.sh
+ENTRYPOINT ["/entrypoint.sh"]

action.yml

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+name: Prettier Action
+description: Automatically runs prettier on all your changes.
+
+author: Conrad Großer <grosserconrad@gmail.com>
+
+inputs:
+  commit_message:
+    description: Commit message
+    required: false
+    default: 'Prettified Code!'
+  commit_options:
+    description: Commit options
+    required: false
+  file_pattern:
+    description: File pattern used for `git add`
+    required: false
+    default: '*'
+  branch:
+    description: Target branch for the changes
+    required: true
+  folder:
+    description: Folder the action searches
+    required: false
+    default: '.'
+
+runs:
+  using: 'docker'
+  image: 'Dockerfile'
+
+branding:
+  icon: 'award'
+  color: 'green'

entrypoint.sh

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+#!/bin/sh
+# e is for exiting the script automatically if a command fails, u is for exiting if a variable is not set
+# x would be for showing the commands before they are executed
+set -eu
+
+# FUNCTIONS
+# Function for setting up git env in the docker container (copied from https://github.com/stefanzweifel/git-auto-commit-action/blob/master/entrypoint.sh)
+_git_setup ( ) {
+    cat <<- EOF > $HOME/.netrc
+      machine github.com
+      login $GITHUB_ACTOR
+      password $GITHUB_TOKEN
+      machine api.github.com
+      login $GITHUB_ACTOR
+      password $GITHUB_TOKEN
+EOF
+    chmod 600 $HOME/.netrc
+
+    git config --global user.email "actions@github.com"
+    git config --global user.name "GitHub Action"
+}
+
+# Checks if any files are changed
+_git_changed() {
+    [[ -n "$(git status -s)" ]]
+}
+
+# Pushes to the according upstream (origin or input branch)
+_git_push() {
+    if [ -z "$INPUT_BRANCH" ]
+    then
+        git push origin
+    else
+        git push --set-upstream origin "HEAD:$INPUT_BRANCH"
+    fi
+}
+
+# PROGRAM
+# TODO: Add actual commands for compressing
+
+# To keep runtime good, just continue if something was changed
+if _git_changed;
+then
+    # Configure the git environemnt
+    _git_setup
+    echo "Commiting and pushing changes..."
+    # Switch to the actual branch
+    git checkout $INPUT_BRANCH || echo "Problem checking out the specified branch: $INPUT_BRANCH"
+    # Add changes to git
+    git add "${INPUT_FILE_PATTERN}" || echo "Problem adding your files with pattern ${INPUT_FILE_PATTERN}"
+    # Commit and push changes back
+    git commit -m "$INPUT_COMMIT_MESSAGE" --author="$GITHUB_ACTOR <$GITHUB_ACTOR@users.noreply.github.com>" ${INPUT_COMMIT_OPTIONS:+"$INPUT_COMMIT_OPTIONS"}
+    _git_push
+    echo "Changes pushed successfully."
+  fi
+else
+  echo "Nothing to commit. Exiting."
+fi