Set env vars for gems

Dockerfile.azure

@@ -10,7 +10,11 @@ ARG BASE_RUBY_IMAGE_WITH_GEMS_AND_NODE_MODULES=help-for-early-years-providers-ge
 FROM ${BASE_RUBY_IMAGE} AS builder
 
 # Set bundler version
-ENV BUNDLER_VERSION=2.2.26
+ENV BUNDLER_VERSION=2.2.16 \
+  BUNDLE_PATH=/usr/local/bundle \
+  BUNDLE_BIN=/usr/local/bundle/bin \
+  GEM_HOME=/usr/local/bundle
+
 
 # Dependencies for the build
 # git: version manager
@@ -61,7 +65,12 @@ ENV GOVUK_APP_DOMAIN=www.gov.uk \
   RAILS_ENV=${RAILS_ENV} \
   AUTHORIZED_HOSTS=127.0.0.1 \
   SECRET_KEY_BASE=TestKey \
-  IGNORE_SECRETS_FOR_BUILD=1
+  IGNORE_SECRETS_FOR_BUILD=1 \
+  BUNDLER_VERSION=2.2.16 \
+  BUNDLE_PATH=/usr/local/bundle \
+  BUNDLE_BIN=/usr/local/bundle/bin \
+  GEM_HOME=/usr/local/bundle
+
 
 #    RACK_ENV=${RAILS_ENV} \
 #    LANG=C.UTF-8 \