1. Fix Dockerfile.builder file for an updated version of Git.
2. Update documentation with some notes on getting netopeer2-cli
   docker to work correctly on MacOS.

Change-Id: I3406af2130a74f6dead9dde074dbf29968f5cff2
diff --git a/build/tools/Dockerfile.builder b/build/tools/Dockerfile.builder
index f84c03a..a3c27c3 100644
--- a/build/tools/Dockerfile.builder
+++ b/build/tools/Dockerfile.builder
@@ -31,7 +31,7 @@
 
 RUN mkdir -m 777 /.cache /go/pkg
 
-RUN apk add --no-cache build-base=0.5-r2 pcre2-dev=10.36-r0 git=2.30.2-r0 cmake=3.18.4-r1
+RUN apk add --no-cache build-base=0.5-r2 pcre2-dev=10.36-r0 git=2.30.3-r0 cmake=3.18.4-r1
 
 # Dependencies install their library files in lib64, add it to the path
 RUN echo "/lib:/usr/local/lib:/usr/lib:/usr/local/lib64" > /etc/ld-musl-x86_64.path
@@ -83,4 +83,4 @@
 org.label-schema.vcs-ref=$org_label_schema_vcs_ref \
 org.label-schema.build-date=$org_label_schema_build_date \
 org.opencord.vcs-commit-date=$org_opencord_vcs_commit_date \
-org.opencord.vcs-dirty=$org_opencord_vcs_dirty
\ No newline at end of file
+org.opencord.vcs-dirty=$org_opencord_vcs_dirty