Set up devcontainers

.devcontainer/Dockerfile

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+# Use a lightweight base image
+FROM ubuntu:20.04
+
+# Set environment variables for non-interactive installation
+ENV DEBIAN_FRONTEND=noninteractive
+
+# Update and install required packages
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    build-essential \
+    software-properties-common \
+    wget \
+    git \
+    curl \
+    tar \
+    gzip \
+    cmake \
+    ninja-build \
+    gcc \
+    g++ \
+    python3 \
+    python3-pip \
+    libstdc++-arm-none-eabi-newlib \
+    && apt-get clean \
+    && rm -rf /var/lib/apt/lists/*
+
+# Download and install xpack ARM GCC toolchain
+RUN ARCH=$(uname -m) && \
+    case "$ARCH" in \
+      x86_64) DOWNLOAD_URL="https://github.com/xpack-dev-tools/arm-none-eabi-gcc-xpack/releases/download/v13.3.1-1.1/xpack-arm-none-eabi-gcc-13.3.1-1.1-linux-x64.tar.gz";; \
+      aarch64) DOWNLOAD_URL="https://github.com/xpack-dev-tools/arm-none-eabi-gcc-xpack/releases/download/v13.3.1-1.1/xpack-arm-none-eabi-gcc-13.3.1-1.1-linux-arm64.tar.gz";; \
+      arm*) DOWNLOAD_URL="https://github.com/xpack-dev-tools/arm-none-eabi-gcc-xpack/releases/download/v13.3.1-1.1/xpack-arm-none-eabi-gcc-13.3.1-1.1-linux-arm.tar.gz";; \
+      *) echo "Unsupported architecture: $ARCH" && exit 1;; \
+    esac && \
+    wget -O gcc.tar.gz "$DOWNLOAD_URL" && \
+    mkdir -p /opt/arm-gcc && \
+    tar -xzf gcc.tar.gz -C /opt/arm-gcc --strip-components=1 && \
+    rm gcc.tar.gz && \
+    ln -s /opt/arm-gcc/bin/* /usr/local/bin/
+
+# Verify installation
+RUN arm-none-eabi-gcc --version
+
+# Set the working directory inside the container
+WORKDIR /workspaces/stm32-devops-template
+
+# Default command for the container
+CMD ["bash"]

.devcontainer/devcontainer.json

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+{
+    "name": "Development container for STM32",
+    "build": {
+        "dockerfile": "Dockerfile"
+    },
+    "workspaceFolder": "/workspaces/stm32-devops-template",
+    "customizations": {
+        "vscode": {
+            "extensions": [
+                "ms-vscode.cmake-tools",
+                "ms-vscode.cpptools"
+            ]
+        }
+    },
+    "mounts": [
+        "source=${localWorkspaceFolder},target=/workspaces/stm32-devops-template,type=bind"
+    ],
+    "postCreateCommand": "echo 'Dev environment ready!'"
+}