[BUG] The action replaces the current entry instead of adding a new one

[EDM115]

Expected Behavior

The action should update the list of Authors

Current Behavior

The action replaces the list of authors

Possible Solution

We could change the run function :

export async function run() {
  try {
    const { context } = github
    const options = getOptions()
    const octokit = getOctokit()
    const authors = await getAuthors()
    const lines: string[] = []

    core.debug(JSON.stringify(options, null, 2))
    core.debug(JSON.stringify(authors, null, 2))

    mustache.parse(options.template)

    if (options.sort === 'commits') {
      authors.sort((a, b) => a.commits - b.commits)
    }

    const filteredAuthors = authors.filter((author) =>
      options.bots || !author.name.includes('[bot]')
    )

    const getContent = async () => {
      try {
        return await octokit.rest.repos.getContent({
          ...github.context.repo,
          path: options.path,
        })
      } catch (err) {
        return null
      }
    }

    const res = await getContent()
    const oldContent = res
      ? Buffer.from((res.data as any).content, 'base64').toString()
      : ''
    
    core.debug(`previous content: \n${oldContent}`)

    const oldAuthors = oldContent
      .split('\n')
      .map(line => line.trim())
      .filter(line => line.length > 0)

    const newAuthorsSet = new Set(oldAuthors)

    filteredAuthors.forEach(author => {
      const renderedAuthor = mustache.render(options.template, author)
      newAuthorsSet.add(renderedAuthor)
    })

    const newAuthorsArray = Array.from(newAuthorsSet)
    
    if (options.sort === 'alphabet') {
      newAuthorsArray.sort()
    }

    const newContent = newAuthorsArray.join('\n')
    core.debug(`generated content: \n${newContent}`)

    if (oldContent !== newContent) {
      await octokit.rest.repos.createOrUpdateFileContents({
        ...context.repo,
        path: options.path,
        content: Buffer.from(newContent).toString('base64'),
        message: options.commit,
        sha: res ? (res.data as any).sha : undefined,
      })
      core.info(`${oldContent ? 'Updated' : 'Generated'}: "${options.path}"`)
    } else {
      core.info(`No changes to "${options.path}"`)
    }
  } catch (e) {
    core.error(e)
    core.setFailed(e.message)
  }
}

Steps To Reproduce

You can check here : https://github.com/EDM115/unzip-bot/commits/master/AUTHORS
Especially here : EDM115/unzip-bot@943cee9?diff=unified

Additional Context

Your Environment

• action version: 1.1.4
• OS: Linux Ubuntu latest
• Browser: Chrome 131.0.6753.0