ci: adapt Docker build workflow for DOS fork

- Change runs-on from blockscout self-hosted runner to ubuntu-latest
- Disable multi-platform build (no ARM runner available)
- Update image tags from ghcr.io/blockscout/blockscout to ghcr.io/dos/doscan
- Remove ARM runner secrets references

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: JOY

.github/actions/setup-repo/action.yml

@@ -17,7 +17,7 @@ inputs:
   docker-image:
     description: 'Docker image'
     required: true
-    default: ghcr.io/blockscout/blockscout
+    default: ghcr.io/dos/doscan
 outputs:
   docker-builder:
     description: 'Docker builder'

.github/workflows/publish-regular-docker-image-on-demand.yml

@@ -14,31 +14,27 @@ permissions:
 jobs:
   push_to_registry:
     name: Push Docker image to GitHub Container Registry
-    runs-on: build
+    runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v5
       - name: Setup repo
         uses: ./.github/actions/setup-repo
         id: setup
         with:
           github-token: ${{ secrets.GITHUB_TOKEN }}
-          docker-remote-multi-platform: true
-          docker-arm-host: ${{ secrets.ARM_RUNNER_HOSTNAME }}
-          docker-arm-host-key: ${{ secrets.ARM_RUNNER_KEY }}
+          docker-remote-multi-platform: false
 
       - name: Build and push Docker image (indexer + API)
         uses: docker/build-push-action@v6
         with:
           context: .
           file: ./docker/Dockerfile
           push: true
-          cache-from: type=registry,ref=ghcr.io/blockscout/blockscout:buildcache
-          cache-to: type=registry,ref=ghcr.io/blockscout/blockscout:buildcache,mode=max
-          tags: ghcr.io/blockscout/blockscout:${{ env.RELEASE_VERSION }}.commit.${{ env.SHORT_SHA }}
+          cache-from: type=registry,ref=ghcr.io/dos/doscan:buildcache
+          cache-to: type=registry,ref=ghcr.io/dos/doscan:buildcache,mode=max
+          tags: ghcr.io/dos/doscan:${{ env.RELEASE_VERSION }}.commit.${{ env.SHORT_SHA }}
           labels: ${{ steps.setup.outputs.docker-labels }}
-          platforms: |
-            linux/amd64
-            linux/arm64/v8
+          platforms: linux/amd64
           build-args: |
             DECODE_NOT_A_CONTRACT_CALLS=false
             MIXPANEL_URL=
@@ -54,11 +50,9 @@ jobs:
           context: .
           file: ./docker/Dockerfile
           push: true
-          tags: ghcr.io/blockscout/blockscout:${{ env.RELEASE_VERSION }}.commit.${{ env.SHORT_SHA }}-indexer
+          tags: ghcr.io/dos/doscan:${{ env.RELEASE_VERSION }}.commit.${{ env.SHORT_SHA }}-indexer
           labels: ${{ steps.setup.outputs.docker-labels }}
-          platforms: |
-            linux/amd64
-            linux/arm64/v8
+          platforms: linux/amd64
           build-args: |
             DISABLE_API=true
             DECODE_NOT_A_CONTRACT_CALLS=false