Moved IMDS Emulator/Proxy sources to the sts-agent folder.

sts-agent/Dockerfile

@@ -0,0 +1,8 @@
+FROM python:3.13-slim
+
+RUN pip install --no-cache-dir "google-auth[requests,cryptography]>=2.39.0"
+
+COPY imds_emulator.py /usr/local/bin/imds-emulator
+COPY imds_test.py /usr/local/bin/imds-test
+
+CMD ["/usr/local/bin/imds-emulator"]