Rewrote IMDS emulator in Go, added unit tests.

sts-agent/Dockerfile

@@ -1,13 +1,14 @@
-FROM python:3.13-slim-trixie AS build
+FROM golang:1.27-trixie AS build
 
-# The interpreter path in the virtualenv must match the path in the distroless image.
-RUN ln -s /usr/local/bin/python /usr/bin/python \
-    && /usr/bin/python -m venv /venv \
-    && /venv/bin/pip install --no-cache-dir "google-auth[requests,cryptography]>=2.39.0"
+WORKDIR /src
+COPY go.mod go.sum ./
+RUN go mod download
+COPY main.go main_test.go ./
+RUN CGO_ENABLED=0 go test ./... \
+    && CGO_ENABLED=0 go build -trimpath -ldflags="-s -w" -o /imds-emulator .
 
-FROM gcr.io/distroless/python3-debian13
+FROM gcr.io/distroless/static-debian13
 
-COPY --from=build /venv /venv
-COPY imds_emulator.py imds_test.py /app/
+COPY --from=build /imds-emulator /imds-emulator
 
-ENTRYPOINT ["/venv/bin/python3", "/app/imds_emulator.py"]
+ENTRYPOINT ["/imds-emulator"]