no Debian backports needed anymore

build/Dockerfile

@@ -3,17 +3,12 @@ LABEL [email protected]
 
 ARG DEBIAN_FRONTEND=noninteractive
 
-# need to add backports for newer git - otherwise python3 git module won't work
-RUN echo "deb http://deb.debian.org/debian buster-backports main" > /etc/apt/sources.list.d/buster-backports.list
-
 # python3 and git needed for build-modify-extension.py
 RUN apt -y update && \
-    apt -y install python3 \
+    apt -y install git \
+                   python3 \
                    python3-git
 
-# need to add backports for newer git - otherwise python3 git module won't work
-RUN apt -y install -t buster-backports git
-
 # scripts used need to be executable
 COPY build/build-entrypoint.sh build/build-modify-extension.py /
 RUN chmod +x /build-entrypoint.sh /build-modify-extension.py