BED-5547 Don't try to login to dockerhub for PRs from forks (#1209)

Forks don't have access to the necesssary secrets

.github/actions/build-container-image/action.yml

@@ -150,6 +150,7 @@ runs:
   steps:
     - uses: docker/login-action@v3
       name: Authenticate with DockerHub Registry
+      if: ${{ github.event.repository.fork == false }}
       with:
         registry: docker.io
         username: ${{ inputs.dockerhub_account }}

.github/workflows/reusable.build-container-image.yml

@@ -195,7 +195,7 @@ jobs:
       # TODO: don't pull actions but instead reference them from the source repo
       # May need to adjust repo actions permissions to allow access from other org repos
       # https://docs.github.com/en/repositories/managing-your-repositorys-settings-and-features/enabling-features-for-your-repository/managing-github-actions-settings-for-a-repository#allowing-access-to-components-in-a-private-repository
-      - if: ${{ github.repository != 'SpecterOps/BloodHound' }}
+      - if: ${{ github.repository != 'SpecterOps/BloodHound' && github.event.repository.fork == false }}
         name: Checkout Reusable Workflows and Composite Actions
         uses: actions/checkout@v4
         with: