docker: publish images to ghcr.io (#8066)

* docker: publish images to ghcr.io

docker.com announced their intention to remove the free plan used by
OSS. The nixos/nix image is essential to various CI runs to build with
nix. To provide a continuity plan, this commit pushes the image to
ghcr.io as well.

Co-authored-by: Sandro <sandro.jaeckel@gmail.com>

.github/workflows/ci.yml

@@ -101,6 +101,9 @@ jobs:
 
   docker_push_image:
     needs: [check_secrets, tests]
+    permissions:
+      contents: read
+      packages: write
     if: >-
       github.event_name == 'push' &&
       github.ref_name == 'master' &&
@@ -126,6 +129,9 @@ jobs:
     - run: docker load -i ./result/image.tar.gz
     - run: docker tag nix:$NIX_VERSION nixos/nix:$NIX_VERSION
     - run: docker tag nix:$NIX_VERSION nixos/nix:master
+    # We'll deploy the newly built image to both Docker Hub and Github Container Registry.
+    #
+    # Push to Docker Hub first
     - name: Login to Docker Hub
       uses: docker/login-action@v3
       with:
@@ -133,3 +139,20 @@ jobs:
         password: ${{ secrets.DOCKERHUB_TOKEN }}
     - run: docker push nixos/nix:$NIX_VERSION
     - run: docker push nixos/nix:master
+    # Push to GitHub Container Registry as well
+    - name: Login to GitHub Container Registry
+      uses: docker/login-action@v3
+      with:
+        registry: ghcr.io
+        username: ${{ github.actor }}
+        password: ${{ secrets.GITHUB_TOKEN }}
+    - name: Push image
+      run: |
+        IMAGE_ID=ghcr.io/${{ github.repository_owner }}/nix
+        # Change all uppercase to lowercase
+        IMAGE_ID=$(echo $IMAGE_ID | tr '[A-Z]' '[a-z]')
+
+        docker tag nix:$NIX_VERSION $IMAGE_ID:$NIX_VERSION
+        docker tag nix:$NIX_VERSION $IMAGE_ID:master
+        docker push $IMAGE_ID:$NIX_VERSION
+        docker push $IMAGE_ID:master

doc/manual/src/installation/installing-docker.md

@@ -3,14 +3,14 @@
 To run the latest stable release of Nix with Docker run the following command:
 
 ```console
-$ docker run -ti nixos/nix
-Unable to find image 'nixos/nix:latest' locally
-latest: Pulling from nixos/nix
+$ docker run -ti ghcr.io/nixos/nix
+Unable to find image 'ghcr.io/nixos/nix:latest' locally
+latest: Pulling from ghcr.io/nixos/nix
 5843afab3874: Pull complete
 b52bf13f109c: Pull complete
 1e2415612aa3: Pull complete
 Digest: sha256:27f6e7f60227e959ee7ece361f75d4844a40e1cc6878b6868fe30140420031ff
-Status: Downloaded newer image for nixos/nix:latest
+Status: Downloaded newer image for ghcr.io/nixos/nix:latest
 35ca4ada6e96:/# nix --version
 nix (Nix) 2.3.12
 35ca4ada6e96:/# exit