devcontainer: add devcontainer.json and automations.yaml

Add a devcontainer configuration for the SOF repository using the
mcr.microsoft.com/devcontainers/cpp:1-ubuntu-24.04 base image with
Python 3.12. This provides a reproducible development environment
with cmake, ninja, gcc, and gdb pre-installed.

The automations.yaml defines three tasks:
- installDeps: installs ninja-build, clang, llvm, device-tree-compiler,
  python3-pyelftools, libasound2-dev, and west on container start.
- westUpdate: runs 'west init -l . && west update' to fetch Zephyr and
  all manifest dependencies, triggered after installDeps completes.
- buildTools: manually-triggered task that runs scripts/build-tools.sh
  to build host-side tools (logger, ctl, probes, topologies).

Signed-off-by: gman4001 <gamblecolton4@gmail.com>
Co-authored-by: Ona <no-reply@ona.com>

Author: gman4001

.devcontainer/devcontainer.json

@@ -0,0 +1,17 @@
+{
+	"name": "SOF",
+	"image": "mcr.microsoft.com/devcontainers/cpp:1-ubuntu-24.04",
+	"features": {
+		"ghcr.io/devcontainers/features/python": {
+			"version": "3.12"
+		}
+	},
+	"customizations": {
+		"vscode": {
+			"extensions": [
+				"ms-vscode.cmake-tools",
+				"ms-vscode.cpptools"
+			]
+		}
+	}
+}

.ona/automations.yaml

@@ -0,0 +1,53 @@
+tasks:
+  installDeps:
+    name: Install SOF build dependencies
+    description: |
+      Install system packages required to build SOF firmware and tools:
+      ninja-build, clang, llvm, device-tree-compiler, python3-pyelftools,
+      and the west Zephyr meta-tool.
+    command: |
+      sudo apt-get update -qq
+      sudo apt-get install -y \
+        ninja-build \
+        clang \
+        llvm \
+        device-tree-compiler \
+        python3-pyelftools \
+        libasound2-dev \
+        libglib2.0-dev \
+        libssl-dev \
+        pkg-config
+      pip3 install --user west
+      echo 'export PATH="$HOME/.local/bin:$PATH"' >> ~/.bashrc
+      export PATH="$HOME/.local/bin:$PATH"
+      west --version
+    triggeredBy:
+      - postDevcontainerStart
+
+  westUpdate:
+    name: Initialize west workspace
+    description: |
+      Run west init and west update to fetch Zephyr and all SOF manifest
+      dependencies. This is required before any firmware build.
+    command: |
+      export PATH="$HOME/.local/bin:$PATH"
+      # west init -l uses the local manifest (west.yml) without re-cloning sof
+      west init -l .
+      west update --narrow --fetch-opt=--filter=tree:0
+    triggeredBy:
+      - postDevcontainerStart
+    dependsOn:
+      - installDeps
+
+  buildTools:
+    name: Build SOF host tools
+    description: |
+      Build the SOF host-side tools (logger, ctl, probes, topologies) using
+      CMake + Ninja. Run manually after west workspace is initialized.
+    command: |
+      export PATH="$HOME/.local/bin:$PATH"
+      ./scripts/build-tools.sh
+    triggeredBy:
+      - manual
+    dependsOn:
+      - westUpdate