move to github container registry + CI speedup (#19621)

Dockerfile.openpilot

@@ -0,0 +1,28 @@
+FROM commaai/openpilot-base:latest
+
+ENV PYTHONUNBUFFERED 1
+ENV PYTHONPATH /tmp/openpilot:${PYTHONPATH}
+
+RUN mkdir -p /tmp/openpilot
+
+COPY SConstruct \
+     .pylintrc \
+     .pre-commit-config.yaml \
+     /tmp/openpilot/
+
+COPY ./pyextra /tmp/openpilot/pyextra
+COPY ./phonelibs /tmp/openpilot/phonelibs
+COPY ./site_scons /tmp/openpilot/site_scons
+COPY ./laika /tmp/openpilot/laika
+COPY ./laika_repo /tmp/openpilot/laika_repo
+COPY ./rednose /tmp/openpilot/rednose
+COPY ./tools /tmp/openpilot/tools
+COPY ./release /tmp/openpilot/release
+COPY ./common /tmp/openpilot/common
+COPY ./opendbc /tmp/openpilot/opendbc
+COPY ./cereal /tmp/openpilot/cereal
+COPY ./panda /tmp/openpilot/panda
+COPY ./selfdrive /tmp/openpilot/selfdrive
+
+WORKDIR /tmp/openpilot
+RUN scons -j$(nproc)