potiuk commented on a change in pull request #19819:
URL: https://github.com/apache/airflow/pull/19819#discussion_r756923132



##########
File path: 
docs/docker-stack/docker-examples/restricted/restricted_environments.sh
##########
@@ -22,28 +22,29 @@ AIRFLOW_SOURCES="$(cd "$(dirname 
"${BASH_SOURCE[0]}")/../../../../" && pwd)"
 cd "${AIRFLOW_SOURCES}"
 
 # [START download]
+export AIRFLOW_VERSION="2.3.0.dev0"
 rm docker-context-files/*.whl docker-context-files/*.tar.gz 
docker-context-files/*.txt || true
 
 curl -Lo "docker-context-files/constraints-3.7.txt" \
-    
https://raw.githubusercontent.com/apache/airflow/constraints-2.3.0.dev0/constraints-3.7.txt
+    
"https://raw.githubusercontent.com/apache/airflow/constraints-${AIRFLOW_VERSION}/constraints-3.7.txt";
 
 # For Airflow pre 2.1 you need to use PIP 20.2.4 to install/download Airflow 
packages.
 pip install pip==20.2.4

Review comment:
       Yeah. Lets' remove it It used to be needed at the beginning when I 
wanted to show example of using previous PIP version but that need is long gone.




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