Fix for http cloning not working in docker

Author: holly sparkles

Dockerfile

@@ -7,6 +7,13 @@ WORKDIR /sources
 RUN cargo build --release
 
 FROM debian:bullseye-slim
+
+# Install git and cleanup package lists.
+# This is required for git-http-backend to work.
+RUN apt-get update && \
+    apt-get install -y git && \
+    rm -rf /var/lib/apt/lists/*
+
 COPY --from=builder /sources/target/release/rgit /rgit
 
 COPY ./scripts/docker/entrypoint.sh .