update to build appropriately

.devcontainer/devcontainer.json

@@ -0,0 +1,22 @@
+// For format details, see https://aka.ms/devcontainer.json. For config options, see the
+// README at: https://github.com/devcontainers/templates/tree/main/src/debian
+{
+	"name": "Debian",
+	// Or use a Dockerfile or Docker Compose file. More info: https://containers.dev/guide/dockerfile
+	"image": "mcr.microsoft.com/devcontainers/base:bullseye",
+	"features": {
+		"ghcr.io/devcontainers/features/docker-in-docker:2": {}
+	}
+
+	// Features to add to the dev container. More info: https://containers.dev/features.
+	// "features": {},
+
+	// Use 'forwardPorts' to make a list of ports inside the container available locally.
+	// "forwardPorts": [],
+
+	// Configure tool-specific properties.
+	// "customizations": {},
+
+	// Uncomment to connect as root instead. More info: https://aka.ms/dev-containers-non-root.
+	// "remoteUser": "root"
+}

Dockerfile

@@ -2,25 +2,31 @@ FROM golang:alpine AS lib_builder
 
 WORKDIR /foundry
 
-RUN apk add git make linux-headers cmake g++
+# install build deps (use build-base to get gcc/g++)
+RUN apk add --no-cache git build-base linux-headers cmake
 RUN git clone https://github.com/jgarff/rpi_ws281x.git \
   && cd rpi_ws281x \
   && mkdir build \
   && cd build \
   && cmake -D BUILD_SHARED=OFF -D BUILD_TEST=OFF .. \
-  && cmake --build . \
-  && make install
+  && cmake --build . --target install
 
 # Stage 1 : Build a go image with the rpi_ws281x C library and the go wrapper
 
+
 FROM golang:alpine
 COPY --from=lib_builder /usr/local/lib/libws2811.a /usr/local/lib/
 COPY --from=lib_builder /usr/local/include/ws2811 /usr/local/include/ws2811
-RUN apk add git make linux-headers cmake g++
+
+# enable cgo and install build deps for the Go build
+ENV CGO_ENABLED=1
+RUN apk add --no-cache git build-base linux-headers cmake
+
 WORKDIR /go/src/github.com/rpi-ws281x/rpi-ws281x-go
 COPY . .
-RUN GO111MODULE=off go get -d -v ./...
-RUN GO111MODULE=off go build -v ./...
+# Build in GOPATH mode (this repo has no go.mod).
+ENV GO111MODULE=off
+RUN go build -v ./...
 
 WORKDIR /go