Update Docker build workflow with dynamic job name

Adds a dynamic job name based on the chain network input and updates Docker build context and file paths to use absolute paths. This improves clarity in workflow runs and ensures correct Dockerfile resolution.

.github/workflows/build-docker.yml

@@ -17,6 +17,7 @@ on:
 
 jobs:
   build:
+    name: "lthn/chain:${{ inputs.chain-network == 'testnet' && 'testnet' || 'latest' }}"
     runs-on: ubuntu-22.04
     steps:
       - name: Checkout Project
@@ -39,8 +40,8 @@ jobs:
         id: docker_build
         uses: docker/build-push-action@v5
         with:
-          file: utils/docker/images/chain-node
-          context: .
+          file: ${{ github.workspace }}/utils/docker/images/chain-node/Dockerfile
+          context: ${{ github.workspace }}
           push: true
           tags: lthn/chain:${{ inputs.chain-network == 'testnet' && 'testnet' || 'latest' }}