Fix CI for external PRs (#8766)

### Steps to test:
- CI should pass and Docker push steps should exist (in this PR)

### Issues:
- fixes broken CI for #8680

Author: robert-oleynik

.github/workflows/build_test_deploy.yml

@@ -263,44 +263,58 @@ jobs:
         run: docker compose --file .github/docker-compose.yml down --volumes --remove-orphans
 
       - uses: docker/login-action@v3
+        if: ${{ github.actor != 'dependabot[bot]' &&
+          (github.event_name != 'pull_request' || github.event.pull_request.head.repo.full_name == github.repository) }}
         with:
           username: ${{ secrets.DOCKER_USER }}
           password: ${{ secrets.DOCKER_PASS }}
 
       - name: Push webknossos image
-        if: ${{ ! startsWith(github.ref, 'refs/tags/') }}
+        if: ${{ ! startsWith(github.ref, 'refs/tags/') &&
+          github.actor != 'dependabot[bot]' &&
+          (github.event_name != 'pull_request' || github.event.pull_request.head.repo.full_name == github.repository) }}
         uses: ./.github/actions/retry
         with:
           run: docker push "scalableminds/webknossos:${{ env.DOCKER_TAG }}"
           retries: 5
           retry_delay_seconds: 10
       - name: Push normalized webknossos image
+        if: ${{ github.actor != 'dependabot[bot]' &&
+          (github.event_name != 'pull_request' || github.event.pull_request.head.repo.full_name == github.repository) }}
         uses: ./.github/actions/retry
         with:
           run: docker push "scalableminds/webknossos:${{ env.NORMALIZED_BRANCH }}"
           retries: 5
           retry_delay_seconds: 10
       - name: Push webknossos-datastore image
-        if: ${{ ! startsWith(github.ref, 'refs/tags/') }}
+        if: ${{ ! startsWith(github.ref, 'refs/tags/') &&
+          github.actor != 'dependabot[bot]' &&
+          (github.event_name != 'pull_request' || github.event.pull_request.head.repo.full_name == github.repository) }}
         uses: ./.github/actions/retry
         with:
           run: docker push "scalableminds/webknossos-datastore:${{ env.DOCKER_TAG }}"
           retries: 5
           retry_delay_seconds: 10
       - name: Push normalized webknossos-datastore image
+        if: ${{ github.actor != 'dependabot[bot]' &&
+          (github.event_name != 'pull_request' || github.event.pull_request.head.repo.full_name == github.repository) }}
         uses: ./.github/actions/retry
         with:
           run: docker push "scalableminds/webknossos-datastore:${{ env.NORMALIZED_BRANCH }}"
           retries: 5
           retry_delay_seconds: 10
       - name: Push webknossos-tracingstore image
-        if: ${{ ! startsWith(github.ref, 'refs/tags/') }}
+        if: ${{ ! startsWith(github.ref, 'refs/tags/') &&
+          github.actor != 'dependabot[bot]' &&
+          (github.event_name != 'pull_request' || github.event.pull_request.head.repo.full_name == github.repository) }}
         uses: ./.github/actions/retry
         with:
           run: docker push "scalableminds/webknossos-tracingstore:${{ env.DOCKER_TAG }}"
           retries: 5
           retry_delay_seconds: 10
       - name: Push normalized webknossos-tracingstore image
+        if: ${{ github.actor != 'dependabot[bot]' &&
+          (github.event_name != 'pull_request' || github.event.pull_request.head.repo.full_name == github.repository) }}
         uses: ./.github/actions/retry
         with:
           run: docker push "scalableminds/webknossos-tracingstore:${{ env.NORMALIZED_BRANCH }}"