ci: update actions dockerfile for release

Dockerfile

@@ -1,17 +1,3 @@
-# Distroless runs python 3.9.2
-FROM python:3.9.2-slim AS builder
-ADD Docker/builder/rootfs /
-ADD repo_manager /app/repo_manager
-ADD main.py /app/main.py
-WORKDIR /app
-
-# We are installing a dependency here directly into our app source dir
-RUN pip install --target=/app -r /requirements.txt
-
-# A distroless container image with Python and some basics like SSL certificates
-# https://github.com/GoogleContainerTools/distroless
-FROM gcr.io/distroless/python3
-COPY --from=builder /app /app
-WORKDIR /app
-ENV PYTHONPATH /app
-CMD ["/app/main.py"]
+# This file is generated from Docker/ActionDockerfile.j2 as part of the release ci
+# Don't modify it directly
+FROM andrewthetechie/gha-repo-manager:v1.2.1