fix: update environment variable name for base64 KUBECONFIG in build workflow

.gitea/workflows/build-and-push.yaml

@@ -29,8 +29,8 @@ jobs:
       - run: docker push kube-reg.fairfaxmedia.net/papi/svc1:${{ steps.extract_branch.outputs.branch }}  # Push the Docker image 
         name: Push Docker image
       - env:
-          KUBECONFIG: '${{ secrets.KUBEB64 }}'
-        run: mkdir -p $HOME/.kube &&echo "$KUBECONFIG" | base64 -d > $HOME/.kube/config  && 
+          KUBEB64: '${{ secrets.KUBEB64 }}'
+        run: mkdir -p $HOME/.kube &&echo "$KUBEB64" | base64 -d > $HOME/.kube/config  && 
            curl https://fairfaxmedia.net/helm -o /usr/local/bin/helm && chmod +xxx /usr/local/bin/helm && 
            /usr/local/bin/helm upgrade --install papi papi-helm/ --set image.tag=${{ steps.extract_branch.outputs.branch }}  # Deploy the Helm chart