This PR is a resubmission of #74 (see discussion).

Problem Description

When import-codesign-certs@v5 is used multiple times in the same workflow, the same keychain is deleted more than once during the post-job cleanup phase. This results in workflow failures, as the second deletion attempt leads to the following error:

security: SecKeychainDelete: The specified keychain could not be found.
Error: The process '/usr/bin/security' failed with exit code 50

This issue occurs when multiple certificates, such as development and distribution certificates, are imported in separate steps using the same keychain.

Changes Made

• Added a check to only attempt keychain deletion if it was created by the current action instance.

Example Workflow

This PR fixes issues with workflows structured like:

- name: Import Development Certificate
  id: create_keychain
  uses: apple-actions/import-codesign-certs@v5
  with:
    p12-file-base64: ${{ inputs.p12-file-development }}
    p12-password: ${{ inputs.p12-file-development-password }}
- name: Import Distribution Certificate
  uses: apple-actions/import-codesign-certs@v5
  with:
    create-keychain: false
    keychain-password: "${{ steps.create_keychain.outputs.keychain-password }}"
    p12-file-base64: ${{ inputs.p12-file-distribution }}
    p12-password: ${{ inputs.p12-file-distribution-password }}

Notes

I know it's possible to import multiple certificates at once, as mentioned in the README.md. However, I prefer to keep the certificate files separate since they are also used in other locations.