Fix image exporting

.github/workflows/docker.yml

@@ -120,10 +120,17 @@ jobs:
           docker push ${{ env.IMAGE_TAG_DH }}:${{ env.VERSION }}-${{ env.SAFE_ARCH }}
 
       - name: Save image as tar archive
+        if: ${{ ! github.event_name == 'pull_request' }}
         run: |
           docker image ls  # debug
           docker save ${{ env.IMAGE_TAG }}:${{ env.HASH_VERSION }}-${{ env.SAFE_ARCH }} -o ${{ env.SAFE_ARCH }}.tar
 
+      - name: Save image as tar archive (pull request)
+        if: ${{ github.event_name == 'pull_request' }}
+        run: |
+          docker image ls  # debug
+          docker save tdlightbotapi:${{ env.HASH_VERSION }}-${{ env.SAFE_ARCH }} -o ${{ env.SAFE_ARCH }}.tar
+
       - name: Upload image as artifact
         uses: actions/upload-artifact@v2
         with: