Update docker-publish.yml

Corrected building tags for the testing branch

Author: xtr0py

.github/workflows/docker-publish.yml

@@ -50,5 +50,5 @@ jobs:
           context: .
           platforms: linux/amd64
           build-args: VERSION=${{ env.DNSCRYPT_PROXY_VERSION }} 
-          tags: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:latest,${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${{ env.DNSCRYPT_PROXY_VERSION }}
+          tags: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:testing,${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${{ env.DNSCRYPT_PROXY_VERSION }}
           push: true