Add DockerHub secrets to build-docker workflow

The build-docker workflow now requires DOCKERHUB_USERNAME and DOCKERHUB_TOKEN secrets, which are inherited in the _on-push workflow. This ensures DockerHub credentials are available for Docker-related actions.

.github/workflows/_on-push.yml

@@ -44,6 +44,7 @@ jobs:
     uses: ./.github/workflows/build-docker.yml
     with:
       chain-network: ${{ github.ref_name == 'main' && 'mainnet' || 'testnet' }}
+    secrets: inherit
 
   build-docs:
     name: Docs

.github/workflows/build-docker.yml

@@ -3,6 +3,11 @@ permissions:
   contents: read
 on:
   workflow_call:
+    secrets:
+      DOCKERHUB_USERNAME:
+        required: true
+      DOCKERHUB_TOKEN:
+        required: true
     inputs:
       chain-network:
         description: "The network to use, can either be testnet, stagenet or mainnet"