Adjustment to support private crate registries in dockerfiles/entrypoint.sh

Author: gregvirgin

dockerfiles/entrypoint.sh

@@ -28,7 +28,7 @@ done
 set -e
 
 if ! [ -d "${DOCSRS_PREFIX}/crates.io-index/.git" ]; then
-    git clone https://github.com/rust-lang/crates.io-index "${DOCSRS_PREFIX}/crates.io-index"
+    git clone ${REGISTRY_URL:-https://github.com/rust-lang/crates.io-index} "${DOCSRS_PREFIX}/crates.io-index"
     # Prevent new crates built before the container creation to be built
     git --git-dir="$DOCSRS_PREFIX/crates.io-index/.git" branch crates-index-diff_last-seen
 fi