chore: improve missing docker engine detection (#6495)

* chore: detect when docker is not installed

* chore: improve e2e tests requirement

CONTRIBUTING.md

@@ -32,7 +32,7 @@ To run tests:
 - :test_tube: Run `yarn check-types` to check TypeScript types.
 - :test_tube: Run `yarn lint` to run the linter (ESLint).
 
-Note that to run `test:e2e`, first ensure that the environment is correctly setup by running the `run_e2e_env.sh` script.
+Note that to run `test:e2e`, first ensure that the environment is correctly setup by running the `run_e2e_env.sh` script. This script requires a running docker engine.
 
 ```sh
 ./scripts/run_e2e_env.sh start

scripts/run_e2e_env.sh

@@ -16,7 +16,11 @@ function stop_app() {
   kill -s TERM $(cat test-logs/e2e-test-env/simulation.pid)
 }
 
-
+docker version > /dev/null 2>&1
+if [ $? -ne 0 ]; then
+  echo "Docker is not running. Please start Docker and try again."
+  exit 1
+fi
 
 case "$1" in 
     start)   start_app ;;