chore(README): add working with container registry section in FAQ (#78)

Signed-off-by: Evgeniy Frolov <evgeniy.frolov@flant.com>
Co-authored-by: Aleksei Igrychev <alexey.igrychev@flant.com>

README.md

@@ -5,7 +5,7 @@ ___
 
 This action allows you to organize CI/CD with GitHub Actions and [werf](https://github.com/werf/werf).
 
-**Ready-to-use GitHub Actions Workflows** for different CI/CD workflows are available [here](https://werf.io/documentation/v1.2/advanced/ci_cd/github_actions.html#complete-set-of-configurations-for-ready-made-workflows).
+**Ready-to-use GitHub Actions Workflows** for different CI/CD workflows are available [here](https://werf.io/guides/nodejs/400_ci_cd_workflow/040_github_actions.html).
 
 ## How to use
 
@@ -30,6 +30,7 @@ converge:
       env:
         WERF_KUBECONFIG_BASE64: ${{ secrets.KUBE_CONFIG_BASE64_DATA }}
         WERF_ENV: production
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
 ```
 
 ## Versioning
@@ -72,6 +73,39 @@ By default, fetch-depth set to `1` which disables git history when checking out
 
 Setting `fetch-depth` to `0` enables full fetch of git history, and it is a **recommended** approach. It is also possible to limit fetch history with some decent number of commits, which would enable images caching limited to that number of commits, but this would have a negative impact on cache reproducibility.
 
+### Working with container registry
+
+If there is a need to perform authorization using custom credentials or in an external container registry, then you have to use a ready-made action tailored to your container registry (or just run `werf cr login`).
+
+```yaml
+converge:
+  name: Converge
+  runs-on: ubuntu-latest
+  steps:
+
+    - name: Checkout code
+      uses: actions/checkout@v4
+      with:
+        fetch-depth: 0
+    
+    - name: Install werf
+      uses: werf/actions/install@v2
+    
+    - name: cr login
+      run: werf cr login -u ${{ secrets.REGISTRY_USER }} -p ${{ secrets.REGISTRY_TOKEN }} registry.example.com
+    
+    - name: converge
+      run: werf converge
+      env:
+        WERF_KUBECONFIG_BASE64: ${{ secrets.KUBE_CONFIG_BASE64_DATA }}
+        WERF_ENV: production
+        WERF_REPO: registry.example.com/repo
+```
+
+> Environment variables **`WERF_REPO`** and **`GITHUB_TOKEN`** for converge should only be used if building images is required otherwise they can be omitted 
+
+In the simplest case, if an [integrated GitHub Packages-like container registry](https://help.github.com/en/packages/using-github-packages-with-your-projects-ecosystem/configuring-docker-for-use-with-github-packages) is used, then the authorization is performed automatically when the `werf ci-env` command is invoked. This command is run with several required arguments such as GitHub environment variables, the [`GITHUB_TOKEN` secret](https://help.github.com/en/actions/configuring-and-managing-workflows/authenticating-with-the-github_token#about-the-github_token-secret) (you have to explicitly declare it).
+
 ## License
 
 Apache License 2.0, see [LICENSE](LICENSE)