Pipeline: Add Runpod docker configuration (#222)

* Begin work on Runpod docker config

* Reduce docker image size

* Create .dockerignore

tooling/pipeline/runpod/README.md

@@ -0,0 +1,8 @@
+```bash
+touch runpod/start.sh
+docker build \
+ --progress=plain \
+ -t biergarten-pipeline:latest \
+ -f runpod/Dockerfile \
+ . 2>&1 | tee build.log
+```