github: move to Github Packages registry

* keep up-to-date with GitHub Dependabot
> https://docs.github.com/en/github/administering-a-repository/keeping-your-actions-up-to-date-with-github-dependabot

(cherry picked from commit 106262000c98e93416520e725f35f9a3269c9ea8)

.github/workflows/dockerhub.yml

@@ -29,16 +29,17 @@ jobs:
         uses: docker/setup-qemu-action@v2
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v2
-      - name: Login to DockerHub
+      - name: Login to GitHub Registry
         uses: docker/login-action@v2
         with:
-          username: ${{ secrets.DOCKERHUB_USERNAME }}
-          password: ${{ secrets.DOCKERHUB_TOKEN }}
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
       - name: Build and push
-        uses: docker/build-push-action@v3
+        uses: docker/build-push-action@v4
         with:
           context: "{{defaultContext}}:${{ matrix.dist }}"
           # we need to build for arm64 first
           # platforms: linux/amd64,linux/arm64
           push: true
-          tags: kamailio/kamailio:${{ github.ref_name }}-${{ matrix.dist }}
+          tags: ghcr.io/kamailio/kamailio:${{ github.ref_name }}-${{ matrix.dist }}