Remove as builder element as well

deployment/Dockerfile.docker.amd64

@@ -1,6 +1,6 @@
 ARG DOTNET_VERSION=3.1
 
-FROM mcr.microsoft.com/dotnet/core/sdk:${DOTNET_VERSION}-buster as builder
+FROM mcr.microsoft.com/dotnet/core/sdk:${DOTNET_VERSION}-buster
 
 ARG SOURCE_DIR=/src
 ARG ARTIFACT_DIR=/jellyfin

deployment/Dockerfile.docker.arm64

@@ -1,6 +1,6 @@
 ARG DOTNET_VERSION=3.1
 
-FROM mcr.microsoft.com/dotnet/core/sdk:${DOTNET_VERSION}-buster as builder
+FROM mcr.microsoft.com/dotnet/core/sdk:${DOTNET_VERSION}-buster
 
 ARG SOURCE_DIR=/src
 ARG ARTIFACT_DIR=/jellyfin

deployment/Dockerfile.docker.armhf

@@ -1,6 +1,6 @@
 ARG DOTNET_VERSION=3.1
 
-FROM mcr.microsoft.com/dotnet/core/sdk:${DOTNET_VERSION}-buster as builder
+FROM mcr.microsoft.com/dotnet/core/sdk:${DOTNET_VERSION}-buster
 
 ARG SOURCE_DIR=/src
 ARG ARTIFACT_DIR=/jellyfin