Revert Dockerfile

.devcontainer/Dockerfile

@@ -1,12 +0,0 @@
-FROM mcr.microsoft.com/devcontainers/universal:linux
-
-RUN mkdir -p /opt/gcc && \
-    cd /opt/gcc && \
-    wget -q https://developer.arm.com/-/media/Files/downloads/gnu-a/10.3-2021.07/binrel/gcc-arm-10.3-2021.07-x86_64-aarch64-none-elf.tar.xz && \
-    tar xf gcc-arm-10.3-2021.07-x86_64-aarch64-none-elf.tar.xz && \
-    rm gcc-arm-10.3-2021.07-x86_64-aarch64-none-elf.tar.xz && \
-    wget -q https://developer.arm.com/-/media/Files/downloads/gnu-a/10.3-2021.07/binrel/gcc-arm-10.3-2021.07-x86_64-arm-none-eabi.tar.xz && \
-    tar xf gcc-arm-10.3-2021.07-x86_64-arm-none-eabi.tar.xz && \
-    rm gcc-arm-10.3-2021.07-x86_64-arm-none-eabi.tar.xz
-
-ENV PATH=/opt/gcc/gcc-arm-10.3-2021.07-x86_64-aarch64-none-elf/bin:/opt/gcc/gcc-arm-10.3-2021.07-x86_64-arm-none-eabi/bin:$PATH

.devcontainer/devcontainer.json

@@ -1,9 +1,3 @@
 {
-  "build": {
-    "dockerfile": "Dockerfile"
-  },
-  "containerEnv": {
-    "PATH": "/opt/gcc/gcc-arm-10.3-2021.07-x86_64-aarch64-none-elf/bin:/opt/gcc/gcc-arm-10.3-2021.07-x86_64-arm-none-eabi/bin:${PATH}"
-  },
-  "postCreateCommand": "export RPI=3 && ./build.sh"
+  "postCreateCommand": "echo 'Hello, Dev Container!'"
 }