Ubuntu – I get an error for loading an RSA key when doing version automation using github actions

My main idea is that every time I make a commit it looks to see if the phrase NEW_VERSION:5.0.01 (5.0.01 is just an example in this case) exists somewhere in the commit message and replaces it with a constant with this new version.
Here is my code in .yml:

name: Update Version

on:
  push:
    branches:
      - main

jobs:
  update-version:
    runs-on: ubuntu-latest

    steps:
      - name: Checkout repository
        uses: actions/checkout@v2
        with:
          fetch-depth: 0

      - name: Configure SSH
        run: |
          mkdir -p ~/.ssh
          echo "${{ secrets.SSH_PRIVATE_KEY }}" > ~/.ssh/id_rsa
          chmod 600 ~/.ssh/id_rsa
          ssh-keyscan github.com >> ~/.ssh/known_hosts
          git config --global user.email "[email protected]"
          git config --global user.name "joaovitorkc"

      - name: Start SSH agent
        run: eval `ssh-agent -s`

      - name: Install Node.js
        uses: actions/setup-node@v2
        with:
          node-version: '14'

      - name: Get last commit message
        id: last_commit
        run: echo "::set-output name=message::$(git log -1 --pretty=%B)"

      - name: Extract version from commit message
        id: extract_version
        run: echo "::set-output name=version::$(echo ${{ steps.last_commit.outputs.message }} | grep -oP 'NEW_VERSION:Kd+.d+.d+')"

      - name: Update version constant in code
        run: |
          if [ -n "${{ steps.extract_version.outputs.version }}" ]; then
            sed -i "s/const VERSION = ".*";/const VERSION = "${{ steps.extract_version.outputs.version }}";/" src/libs/version.ts
            echo "Version updated to ${{ steps.extract_version.outputs.version }}"
          else
            echo "No new version found in commit message."
          fi

      - name: Commit and push updated version
        env:
          SSH_AUTH_SOCK: /tmp/ssh_agent.sock
        run: |
          ssh-add ~/.ssh/id_rsa
          git commit -am "Update version to ${{ steps.extract_version.outputs.version }}"
          git push

But when this code is run in github actions it gives the following error:

Image with the error

Error details